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KR20060079505A - Hybrid Automotive Battery Voltage Detector Protection Circuit - Google Patents

Hybrid Automotive Battery Voltage Detector Protection Circuit Download PDF

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KR20060079505A
KR20060079505A KR1020040117718A KR20040117718A KR20060079505A KR 20060079505 A KR20060079505 A KR 20060079505A KR 1020040117718 A KR1020040117718 A KR 1020040117718A KR 20040117718 A KR20040117718 A KR 20040117718A KR 20060079505 A KR20060079505 A KR 20060079505A
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battery
relay
microcomputer
voltage
decoder
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KR100697528B1 (en
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박현석
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주식회사 케피코
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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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/92—Hybrid vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using 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
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

본 발명의 하이브리드 자동차용 배터리 관리 시스템(BMS : Battery Management System)의 전압 검출부 보호회로는 마이컴과 릴레이부 전단 사이에 적용한 3-TO-8 디코더로부터 1개의 출력된 선택신호에 의해 동작하기 때문에 종래의 마이컴에 연결된 홀수열 릴레이와 짝수열 릴레이들이 동시에 온되면서 발생하는 과전류로부터 보호될 수 있고, 배터리 전원계통 및 시스템을 보호할 수 있으며, 자동차의 배터리 고장여부를 안정적으로 검출할 수 있고, 마이컴의 포트수가 줄어들어 원가를 절감할 수 있다.Since the voltage detection unit protection circuit of the hybrid vehicle battery management system (BMS) of the present invention operates by one output signal selected from the 3-TO-8 decoder applied between the microcomputer and the front end of the relay unit, The odd-numbered and even-numbered relays connected to the microcomputer can be protected from overcurrent generated by turning on at the same time, can protect the battery power system and system, and can stably detect whether the battery of the car is broken, and the port of the microcomputer The number can be reduced and the cost can be saved.

자동차, 배터리, 릴레이, 디코더, 전압변환부, 마이컴Automotive, Battery, Relay, Decoder, Voltage Converter, Micom

Description

하이브리드 자동차용 배터리 전압 검출부 보호회로{Circuit to protect a voltage detector of battery to be used hybrid car} Circuit to protect a voltage detector of battery to be used hybrid car}             

도 1은 본 발명에 의한 하이브리드 자동차용 배터리 전압 검출부 보호회로의 구성을 나타내는 블록도이다.1 is a block diagram showing the configuration of a battery voltage detection unit protection circuit for a hybrid vehicle according to the present invention.

*도면의 주요부분에 대한 부호설명* Code descriptions for the main parts of the drawings

10 - 배터리10-battery

20 - 릴레이부20-relay

30 - 디코더30-decoder

40 - 배터리 전압변환부 40-battery voltage converter

50 - 마이컴50-Micom

본 발명은 하이브리드 자동차용 배터리 전압 검출부 보호회로에 관한 것으로, 보다 상세하게는 마이컴과 릴레이 사이에 하나의 신호만을 출력하는 3-TO-8 디코더를 채용함에 따라 마이컴의 오동작으로 인한 짝수열과 짝수열의 릴레이 또는 홀수열과 홀수열의 릴레이가 동시에 온이 되는 경우를 방지할 수 있으므로 검출부 회로가 파괴되는 것을 막을 수 있으며 배터리의 입력신호의 단선 및 단락등 고장여부를 진단하는 기능을 안정적으로 행하는 하이브리드 자동차용 배터리 전압 검출부 보호회로에 관한 것이다.The present invention relates to a protection circuit for a battery voltage detection unit for a hybrid vehicle, and more particularly, by employing a 3-TO-8 decoder that outputs only one signal between a microcomputer and a relay, an even-numbered and even-numbered relay due to a malfunction of the microcomputer. Alternatively, the odd-numbered and odd-numbered relays can be prevented from being turned on at the same time, thus preventing the detection circuit from being destroyed. The hybrid vehicle battery voltage stably performs the function of diagnosing a failure such as disconnection or short circuit of the input signal of the battery. It relates to a detector protection circuit.

일반적으로 자동차용 배터리 관리 시스템(BMS : Battery Management System)은 하이브리드 자동차의 구동장치인 전동기의 동력원으로 사용되는 배터리의 수명을 더 연장하고 전동기의 성능과 효율을 개선하기 위해 배터리의 SOC(State Of Charge) 상태를 모니터링 및 제어하는 시스템이다. In general, a battery management system (BMS) for automobiles is a state of charge of a battery to extend the life of the battery used as a power source of the electric motor driving the hybrid vehicle and to improve the performance and efficiency of the motor. ) System that monitors and controls status.

이러한 하이브리드 자동차용 배터리 관리 시스템(BMS)에서 사용하고 있는 종래의 배터리 전압 검출부는 마이컴이 선택하고자 하는 릴레이에 직접적으로 구동신호를 출력하여 릴레이를 구동시키므로 마이컴의 내부 프로그램등의 오동작으로 홀수열의 첫 번째 릴레이와 홀수열의 마지막째 릴레이가 온 되는 경우 또는 짝수열의 첫 번째 릴레이와 짝수열의 마지막째 릴레이가 동시에 온되는 현상이 발생하게 됨에 따라서 매우 큰 전압이 회로에 인가되어 과도한 전류가 흐르게 되고 검출부 회로가 파괴되는 현상을 초래하는 문제가 있다.The conventional battery voltage detection unit used in the hybrid vehicle battery management system (BMS) outputs a driving signal directly to a relay to be selected by the microcomputer to drive the relay. When the relay and the last relay in the odd row are turned on or the first relay in the even row and the last relay in the even row are turned on at the same time, a very large voltage is applied to the circuit and excessive current flows and the detector circuit is destroyed. There is a problem that causes the phenomenon.

결국 종래기술에 의하면, 차량용 배터리에 각각 연결된 홀수열 릴레이와 짝수열 릴레이들은 마이컴의 내부프로그램으로 온/오프시키키 때문에 마이컴 내부프로그램 지연 및 처리오류로 인하여 홀수열 및 짝수열의 릴레이가 동시에 온이 됨에 따라 과전류 발생 및 배터리 검출 회로의 파손 및 시스템 파괴 등을 야기시키는 등의 문제점이 있었다.Eventually, according to the prior art, the odd-numbered and even-numbered relays respectively connected to the vehicle battery are turned on / off by the internal program of the microcomputer, so that the odd-numbered and even-numbered relays are simultaneously turned on due to the microcomputer internal program delay and processing error. Accordingly, there have been problems such as generation of overcurrent, damage to the battery detection circuit, and system destruction.

본 발명은 상기와 같은 종래기술의 문제점을 해결하기 위하여 안출한 것으로서 그 목적은 마이컴과 릴레이 사이에 오직 한 개의 출력만을 발생하는 3-TO-8 디코더를 삽입한 회로를 채용함에 따라 마이컴의 오동작으로 인하여 출력된 신호를 가지고 릴레이를 구동시키더라도 검출부의 회로가 파손되지 않을 뿐 아니라 검출부의 단선이나 단락등을 감지할 수 있는 고장 진단 기능을 가진 하이브리드 자동차용 배터리 전압 검출부 보호회로를 제공하는데 있다.
The present invention has been made to solve the above problems of the prior art, the object of which is a malfunction of the microcomputer by adopting a circuit inserting a 3-TO-8 decoder which generates only one output between the microcomputer and the relay. Therefore, even when the relay is driven with the output signal, the circuit of the detector is not damaged, and a circuit for detecting a hybrid vehicle battery voltage detector having a fault diagnosis function capable of detecting disconnection or short circuit of the detector is provided.

상기와 같은 목적을 달성하기 위하여, 본 발명은 차량용 배터리 전압 검출부 회로를 보호하며 고장 여부를 진단할 수 있는 하이브리드 자동차용 배터리 전압 검출부 보호회로에 있어서,In order to achieve the above object, the present invention provides a hybrid vehicle battery voltage detector protection circuit that can protect the vehicle battery voltage detector circuit and diagnose whether there is a failure,

배터리에 연결되어 배터리의 직류전압을 전압변환부의 입력으로 전달시켜 주는 릴레이부와; A relay unit connected to the battery to transfer a DC voltage of the battery to an input of the voltage conversion unit;

상기 릴레이부의 출력으로부터 입력된 전압값을 마이컴의 입력으로 변환시키주는 배터리 전압변환부와;A battery voltage converting unit converting a voltage value input from an output of the relay unit into an input of a microcomputer;

상기 전압변환부의 변환된 전압값을 입력으로 받아 전압값을 검출하고 원하는 배터리를 선택하기 위한 릴레이를 구동시키는 출력신호를 디코더에 출력하는 마이컴과;A microcomputer that receives the converted voltage value of the voltage converter as an input and outputs an output signal to a decoder to drive a relay for detecting a voltage value and selecting a desired battery;

상기 마이컴의 릴레이 선택신호를 조합하여 한 개의 릴레이를 선택하는 신호를 출력하는 디코더; 를 포함하는 것을 특징으로 한다.A decoder configured to output a signal for selecting one relay by combining the relay selection signal of the microcomputer; Characterized in that it comprises a.

이하, 본 발명에 따른 바람직한 한 실시예를 첨부도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 의한 하이브리드 자동차용 배터리 전압 검출부 보호회로의 구성을 나타내는 블록도이다.1 is a block diagram showing the configuration of a battery voltage detection unit protection circuit for a hybrid vehicle according to the present invention.

도 1를 참조하여, 본 발명의 실시예에 따른 하이브리드 자동차용 배터리 전압 검출부 보호회로의 구성을 설명한다.Referring to FIG. 1, a configuration of a protection circuit of a battery voltage detector for a hybrid vehicle according to an exemplary embodiment of the present invention will be described.

본 발명에 따른 하이브리드 자동차용 배터리 전압 검출부 보호회로는 배터리(10), 릴레이부(20), 디코더(30), 배터리 전압변환부(40), 마이컴(50)로 구성되어 있다.The battery voltage detector protection circuit for a hybrid vehicle according to the present invention includes a battery 10, a relay unit 20, a decoder 30, a battery voltage converter 40, and a microcomputer 50.

상술한 구성의 하이브리드 자동차용 배터리 전압 검출부 보호회로의 상세 구성을 도 1을 참조하면, 도면부호 10은 자체로부터 직류전원을 공급하는 배터리이고, 20은 상기 배터리의 측정하고자 하는 전압을 선택하는 회로를 구성하며 디코더의 신호에 의해 동작하는 릴레이부이며, 30은 마이컴에서 출력된 3개의 신호를 조합하여 8개의 출력중 1개의 릴레이를 구동하는 신호를 출력하는 디코더이고, 40은 릴레이의 출력에서 검출된 전압값을 마이컴이 읽을 수 있는 값으로 변환하는 배터리 전압변환부이며, 50은 상기 전압변환부의 변환된 전압값을 입력으로 받아 전압값을 검출하고 원하는 배터리를 선택하기 위한 릴레이를 구동시키는 출력신호를 디코더에 출력하는 마이컴이다.Referring to FIG. 1 for a detailed configuration of a protection circuit for a hybrid vehicle battery voltage detection unit having the above-described configuration, reference numeral 10 denotes a battery for supplying DC power from itself, and 20 denotes a circuit for selecting a voltage to be measured of the battery. 30 is a decoder which outputs a signal for driving one of the eight outputs by combining three signals output from the microcomputer and 40 is detected at the output of the relay. A battery voltage converting unit converts a voltage value into a value that can be read by a microcomputer, and 50 is an output signal for detecting a voltage value and driving a relay for selecting a desired battery by receiving the converted voltage value of the voltage converting unit as an input. Microcomputer to output to decoder.

상기와 같은 구성을 갖는 본 발명의 실시예에 따른 하이브리드 자동차용 배터리 전압 검출부 보호회로의 동작을 설명하면 다음과 같다. Referring to the operation of the hybrid vehicle battery voltage detector protection circuit according to an embodiment of the present invention having the above configuration as follows.

배터리부(10)의 배터리1의 값을 검출한다고 한다면, 배터리1의 전압값을 검출하기 위해 마이컴(50)은 홀수열 릴레이를 선택하는 신호를 디코더(30A)와 짝수열 릴레이를 선택하는 신호를 디코더(30B)에 출력하게 된다. 3-TO-8 디코더(30A)는 입력신호를 조합하여 8가지 출력중 0A를 출력하여 홀수열의 첫 번째 릴레이를 구동하게 되고, 3-TO-8 디코더(30B)는 0B를 출력하여 짝수열의 첫 번째 릴레이를 구동하게 된다. 이렇게 홀수열과 짝수열의 첫 번째 선택된 각각의 릴레이는 커패시터(C1)에 배터리의 값을 위쪽이 +가 되게 충전시킨다. 충전이 다 되면 릴레이0A, 0B를 오프시킨다. If the value of the battery 1 of the battery unit 10 is detected, the microcomputer 50 receives a signal for selecting the odd-numbered relay and a signal for selecting the even-numbered relay and the decoder 30A to detect the voltage value of the battery 1. It outputs to the decoder 30B. The 3-TO-8 decoder 30A combines an input signal and outputs 0A of eight outputs to drive the first relay in odd rows, and the 3-TO-8 decoder 30B outputs 0B to output the first of even columns. Drive the first relay. In this way, each of the first and second selected relays in odd and even columns charges the capacitor C1 with the battery value up. When charging is complete, turn off relays 0A and 0B.

그리고 충전된 전압값은 다시 마이컴(50)의 제어에 의해 커패시터의 후단의 릴레이3A, 3A'를 동시에 구동시키는 신호를 디코더(30)에 출력하게 되고 디코더(30)는 그 신호를 조합하여 선택된 릴레이를 구동시키게 된다. 이때 릴레이3A의 출력은 커패시터의 +값을 전압변환부(40)에 입력하게 되고 릴레이3A'의 출력은 GND가 되어 GND를 기준으로 +전압값이 전압변환부(40)의 입력값이 된다. 전압변환부(40)는 입력된 값을 마이컴(50)이 읽을 수 있는 값으로 변환하여 마이컴(50)에게 출력하게 된다. 마이컴(50)은 이 값을 읽어 배터리(10)의 배터리1 값을 검출하게 된다. The charged voltage value is again outputted to the decoder 30 a signal for simultaneously driving the relays 3A and 3A 'at the rear end of the capacitor under the control of the microcomputer 50, and the decoder 30 combines the signals to select the relay. Will be driven. At this time, the output of the relay 3A inputs the + value of the capacitor to the voltage converter 40, and the output of the relay 3A 'becomes GND so that the + voltage value becomes the input value of the voltage converter 40 based on GND. The voltage converter 40 converts the input value into a value that the microcomputer 50 can read and output the microcomputer 50 to the microcomputer 50. The microcomputer 50 reads this value and detects the battery 1 value of the battery 10.

배터리(10)의 배터리2 값을 검출 하는 방법은 짝수열의 릴레이0B와 홀수열의 릴레이1A를 선택하는 신호를 마이컴(50)이 디코더(30A,30B)에 출력하게 되고, 디코더(30A,30B)는 이 릴레이를 구동시키게 되어 배터리2의 전압값이 커패시터에 충전하게 되는데 배터리1의 충전방향과 반대가 된다. 즉 아래쪽릴레이4A가 +값으로 충전하게 되고, 릴레이4A'는 GND가 되어 GND를 기준으로 +값이 전압변환부(40)의 입력값이 된다. 전압변환부(40)의 입력단은 항상 +전압값만을 입력받게 되고, 입력된 값은 마이컴(50)이 읽을 수 있는 값으로 변환하여 마이컴(50)에 출력한다. In the method of detecting the battery 2 value of the battery 10, the microcomputer 50 outputs a signal for selecting even-numbered relays 0B and odd-numbered relays 1A to the decoders 30A and 30B, and the decoders 30A and 30B This relay is driven so that the voltage value of the battery 2 is charged to the capacitor, which is opposite to the charging direction of the battery 1. That is, the lower relay 4A charges to the positive value, and the relay 4A 'becomes GND, and the positive value becomes the input value of the voltage converter 40 based on GND. The input terminal of the voltage converter 40 always receives only a + voltage value, and converts the input value into a value that can be read by the microcomputer 50 and outputs it to the microcomputer 50.

본 발명은 특정의 실시예와 관련하여 도시 및 설명하였지만, 첨부된 특허청구범위에 의해 나타난 발명의 사상 및 영역으로부터 벗어나지 않는 한도내에서 다양한 개조 및 변화가 가능하다는 것을 당업계에서 통상의 지식을 가진자라면 누구 나 쉽게 알 수 있을 것이다.While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can grow up easily.

이상 설명한 바와 같은 본 발명에 의한 하이브리드 자동차용 배터리 전압 검출부 보호회로는 마이컴과 릴레이부 전단 사이에 적용한 3-TO-8 디코더로부터 출력되는 하나의 선택신호에 의해 동작하기 때문에 종래의 마이컴에 연결된 홀수열 릴레이와 짝수열 릴레이들이 동시에 온되면서 발생하는 과전류로부터 배터리 전압 검출부 회로 및 시스템을 보호할 수 있고, 자동차의 배터리 고장여부를 안정적으로 검출할 수 있으며, 마이컴의 포트수가 줄어들어 원가를 절감할 수 있는 효과가 있다.As described above, the hybrid vehicle battery voltage detector protection circuit according to the present invention operates by one selection signal output from the 3-TO-8 decoder applied between the microcomputer and the front end of the relay unit, so that the odd-numbered sequence connected to the conventional microcomputer It can protect the battery voltage detector circuit and system from the overcurrent generated when the relay and even-numbered relays are turned on at the same time, can stably detect the failure of the battery of the car, and reduce the cost by reducing the number of ports of the microcomputer. There is.

Claims (1)

차량용 배터리 전압 검출부 회로를 보호하며 고장 여부를 진단할 수 있는 하이브리드 자동차용 배터리 전압 검출부 보호회로에 있어서, In the hybrid vehicle battery voltage detector protection circuit that protects the vehicle battery voltage detector circuit and can diagnose whether there is a failure, 배터리에 연결되어 배터리의 직류전압을 전압변환부의 입력으로 전달시켜 주는 릴레이부와A relay unit connected to the battery to transfer the DC voltage of the battery to the input of the voltage conversion unit; 상기 릴레이부의 출력으로부터 입력된 전압값을 마이컴의 입력으로 변환시키주는 배터리 전압변환부와A battery voltage converting unit converting a voltage value input from an output of the relay unit into an input of a microcomputer; 상기 전압변환부의 변환된 전압값을 입력으로 받아 전압값을 검출하고 원하는 배터리를 선택하기 위한 릴레이를 구동시키는 출력신호를 디코더에 출력하는 마이컴과 A microcomputer that receives the converted voltage value of the voltage converter as an input and outputs an output signal to a decoder to detect a voltage value and drive a relay for selecting a desired battery; 상기 마이컴의 릴레이 선택신호를 조합하여 한 개의 릴레이를 선택하는 신호를 출력하는 디코더를 포함하는 것을 특징으로 하는 하이브리드 자동차용 배터리 전압 검출부 보호회로And a decoder for outputting a signal for selecting one relay by combining the relay selection signal of the microcomputer.
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