KR20130047964A - Adjusting apparatus of output voltage for low voltage dc-dc converter - Google Patents

Adjusting apparatus of output voltage for low voltage dc-dc converter Download PDF

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KR20130047964A
KR20130047964A KR1020110112816A KR20110112816A KR20130047964A KR 20130047964 A KR20130047964 A KR 20130047964A KR 1020110112816 A KR1020110112816 A KR 1020110112816A KR 20110112816 A KR20110112816 A KR 20110112816A KR 20130047964 A KR20130047964 A KR 20130047964A
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voltage
output
switching
converter
unit
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KR1020110112816A
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Korean (ko)
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최덕관
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현대모비스 주식회사
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Priority to CN2012102773556A priority patent/CN103095124A/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
    • 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
    • H02M3/157—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 with digital control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries

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

Abstract

PURPOSE: An output voltage control device of a low voltage DC-DC(Direct Current-Direct Current) converter is provided to reduce manufacturing cost by providing a layout using a passive device. CONSTITUTION: A control unit(110) generates a digital control signal. The signal controls adjustment voltage. A switching unit(120) switches corresponding to the signal. A voltage output unit(130) corresponds to switching of the switch unit. The voltage output unit outputs the adjustment voltage. [Reference numerals] (110) Control unit

Description

저전압 ＤＣ-ＤＣ컨버터의 출력전압조절장치{Adjusting apparatus of output voltage for Low Voltage DC-DC Converter}Adjusting apparatus of output voltage for Low Voltage DC-DC Converter}

본 발명은 차량용 저전압 DC-DC컨버터에 관한 것으로, 차량용 저전압 DC-DC컨버터의 출력전압을 조절하기 위한 저전압 DC-DC컨버터의 출력전압조절장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low voltage DC-DC converter for a vehicle.

종래 차량용 저전압 DC-DC컨버터(Low voltage DC-DC Converter, LDC)는 하이브리드 차량의 고전압 배터리로부터 나오는 고전압 직류전압을 저전압 직류전압으로 변환하여 보조배터리 등의 차량의 전장부하에 제공하는 역할을 한다.The conventional low voltage DC-DC converter (LDC) for a vehicle converts a high voltage DC voltage from a high voltage battery of a hybrid vehicle into a low voltage DC voltage and serves to provide the electric load of a vehicle such as an auxiliary battery.

여기서 차량용 저전압 DC-DC컨버터의 출력전압을 조정하는 것은, 도 1에 도시된 블록도와 같이 상위제어기(12)의 제어신호에 의해 마이크로콘트롤러(14), DAC(Digital to Analog Converter, 16) 및 OP앰프(18)를 거쳐 생성된 조정전압(VREF)에 의해 이루어질 수 있다.Herein, the output voltage of the low-voltage DC-DC converter for a vehicle is controlled by the microcontroller 14, the digital to analog converter 16, and the OP by the control signal of the upper controller 12, as shown in FIG. 1. This may be achieved by the adjustment voltage VREF generated via the amplifier 18.

구체적으로, HCU(Hybrid Control Unit)와 같은 상위제어기(12)로부터 저전압 DC-DC컨버터의 출력전압을 조절하기 위한 제어신호가 CAN통신을 통해 전달되면, 예를 들면 14V가 전달되면 마이크로콘트롤러(14)는 이 값에 대응하는 디지털신호를 DAC(16)로 전달한다. DAC(16)는 이 디지털신호를 아날로그신호로 변환하여 OP앰프(18)로 전달하고, OP앰프(18)는 변환된 아날로그신호를 저전압 DC-DC컨버터의 출력전압을 조절하기 위한 조정전압(VREF)으로 변환하여 저전압 DC-DC컨버터로 전달한다.Specifically, when the control signal for adjusting the output voltage of the low-voltage DC-DC converter from the upper controller 12, such as HCU (Hybrid Control Unit) is transmitted through CAN communication, for example, if the 14V is transferred to the microcontroller 14 ) Transmits the digital signal corresponding to this value to the DAC 16. The DAC 16 converts the digital signal into an analog signal and transmits the digital signal to the OP amplifier 18. The OP amplifier 18 adjusts an output voltage of the low voltage DC-DC converter to the converted voltage VREF. ) And transfer it to the low voltage DC-DC converter.

이와 같이 종래 저전압 DC-DC컨버터의 출력전압 조절기술은, 출력전압을 조정하기 위해 DAC 및 OP앰프와 같은 IC소자가 추가적으로 요구되는 레이아웃을 가지고 있어 회로가 복잡하고, 제조단가도 상승하는 문제를 가지고 있다.As described above, the output voltage control technology of the conventional low voltage DC-DC converter has a layout requiring additional IC elements such as a DAC and an OP amplifier in order to adjust the output voltage, resulting in a complicated circuit and an increase in manufacturing cost. have.

KR 10-2010-0114751 A, 2010. 10. 26, 도면 2KR 10-2010-0114751 A, Oct. 26, 2010, Drawing 2

본 발명의 목적은 종래 저전압 DC-DC컨버터의 출력전압의 조정을 위해 사용하는 DAC 및 OP앰프와 같은 능동 IC소자를 대체할 수 있는 수동소자를 이용한 레이아웃을 도입함으로써 레이아웃을 단순화할 수 있고, 제조단가를 낮출 수 있는 저전압 DC-DC컨버터의 출력전압조절장치를 제공하는 것이다.An object of the present invention is to simplify the layout by introducing a layout using passive elements that can replace active IC elements such as DACs and OP amplifiers used to adjust the output voltage of conventional low voltage DC-DC converters. It is to provide an output voltage regulator of a low voltage DC-DC converter that can lower the cost.

상기 목적을 달성하기 위한 본 발명은 입력된 조정전압에 대응하여 출력전압이 조절되는 저전압 DC-DC컨버터의 출력전압조절장치에 관한 것으로, 본 저전압 DC-DC컨버터의 출력전압조절장치는 상기 조정전압을 제어하기 위한 디지털제어신호를 생성하여 출력하는 제어부; 상기 제어부에 의해 출력된 디지털제어신호에 대응하여 스위칭되는 스위칭부; 및 상기 스위칭부의 스위칭에 대응하여 상기 조정전압을 출력하는 전압출력부;를 포함하는 것을 특징으로 한다.The present invention for achieving the above object relates to an output voltage adjusting device of a low voltage DC-DC converter in which the output voltage is adjusted in response to the input adjustment voltage, the output voltage adjusting device of the low voltage DC-DC converter A control unit for generating and outputting a digital control signal for controlling the control unit; A switching unit which is switched in response to the digital control signal output by the control unit; And a voltage output unit configured to output the adjustment voltage in response to the switching of the switching unit.

상기 제어부는, 디지털제어신호가 상기 조정전압의 출력레벨에 대응하여 신호의 비트수(n)가 정해질 수 있고, 상기 스위칭부는, 상기 비트수(n)에 대응하는 스위칭소자를 구비할 수 있다.The control unit may determine the number of bits n of the signal corresponding to the digital control signal output level of the adjustment voltage, and the switching unit may include a switching element corresponding to the number n of bits. .

상기 제어부는, 디지털제어신호가 상기 조정전압의 출력레벨에 대응하여 신호의 비트수(n)가 정해지고, 상기 스위칭부는, 상기 디지털제어신호의 비트수(n)에 대응하여 복수 개로 구비되고 상기 디지털제어신호에 의해 스위칭되는 스위칭모스펫들을 구비하고, 상기 스위칭모스펫들 각각은 소스단이 접지되고 드레인단이 상기 전압출력부에 연결될 수 있다.The control unit, the number of bits (n) of the signal is determined in accordance with the output level of the adjustment voltage of the digital control signal, the switching unit is provided in plurality in correspondence to the number of bits (n) of the digital control signal Switching MOSFETs are switched by a digital control signal, and each of the switching MOSFETs may have a source terminal grounded and a drain terminal coupled to the voltage output unit.

여기서 상기 전압출력부는 상기 조정전압의 출력단에 각각 연결되는 저항모듈 및 구동직류전원을 구비하고, 상기 저항모듈은 상기 비트수(n) 보다 1개 많은 저항소자들을 구비하고, 상기 저항소자들 각각의 일단이 상기 출력단에 연결되고 상기 저항소자들 중 하나를 제외한 각각의 타단이 상기 스위칭모스펫들 각각의 드레인단에 연결되며, 상기 제외된 저항소자의 타단이 접지될 수 있다. Here, the voltage output unit includes a resistor module and a driving DC power source connected to the output terminal of the regulated voltage, respectively, the resistor module includes one or more resistance elements than the number of bits n, and each of the resistor elements One end is connected to the output terminal, and the other end of each of the switching MOSFETs except one of the resistor elements is connected to the drain end of each of the switching MOSFETs, and the other end of the excluded resistance element may be grounded.

이와 같이 본 발명은 종래 저전압 DC-DC컨버터의 출력전압의 조정을 위해 사용하는 DAC 및 OP앰프와 같은 능동 IC소자를 모스펫과 저항모듈을 이용하여 대체함으로써 레이아웃을 단순화할 수 있고, 제조단가를 낮출 수 있다.As described above, the present invention can simplify the layout by replacing active IC elements such as DACs and OP amplifiers used for adjusting the output voltage of the conventional low voltage DC-DC converter using MOSFETs and resistor modules, and reduce manufacturing costs. Can be.

도 1은 종래 차량용 저전압 DC-DC컨버터의 출력전압의 조절방법을 보여주기 위한 블록도이다.
도 2는 본 발명의 일 실시예에 따른 저전압 DC-DC컨버터의 출력전압조절장치의 회로도이다.1 is a block diagram illustrating a control method of an output voltage of a conventional low voltage DC-DC converter for a vehicle.
2 is a circuit diagram of an output voltage control device of a low voltage DC-DC converter according to an embodiment of the present invention.

이하 첨부된 도면을 참조하여 본 발명의 일 실시예에 따른 저전압 DC-DC컨버터의 출력전압조절장치에 대하여 설명한다. 차량용 저전압 DC-DC컨버터는 차량의 고전압 직류전원으로부터 입력된 전원을 저전압으로 변환하여 차량의 전장부하들에 공급하는 기능을 수행하고, 입력된 조정전압에 대응하여 출력전압이 조정될 수 있다.Hereinafter, an output voltage control device of a low voltage DC-DC converter according to an embodiment of the present invention will be described with reference to the accompanying drawings. The low voltage DC-DC converter for a vehicle performs a function of converting power input from a high voltage DC power source of the vehicle to a low voltage and supplying the electrical loads of the vehicle, and output voltage is adjusted in response to the input adjustment voltage.

도 2는 본 발명의 일 실시예에 따른 저전압 DC-DC컨버터의 출력전압조절장치의 회로도이다. 도 2에 도시된 바와 같이, 저전압 DC-DC컨버터의 출력전압조절장치(100)는 제어부(110), 스위칭부(120) 및 전압출력부(130)로 이루어질 수 있다.2 is a circuit diagram of an output voltage control device of a low voltage DC-DC converter according to an embodiment of the present invention. As shown in FIG. 2, the output voltage adjusting device 100 of the low voltage DC-DC converter may include a control unit 110, a switching unit 120, and a voltage output unit 130.

제어부(110)는 저전압 DC-DC컨버터의 출력전압을 조절하기 위한 조정전압을 제어하기 위한 디지털제어신호를 생성하여 스위칭부(120)로 출력한다. 디지털제어신호는 조정전압의 출력레벨에 대응하여 신호의 비트수(n)가 정해질 수 있다.The controller 110 generates a digital control signal for controlling the adjustment voltage for adjusting the output voltage of the low voltage DC-DC converter and outputs it to the switching unit 120. In the digital control signal, the number of bits n of the signal may be determined corresponding to the output level of the adjustment voltage.

예를 들면, 제어부(110)는 도 2 및 후술하는 표 1에 나타난 바와 같이, 4개 레벨의 조정전압(VREF)을 통해 저전압 DC-DC컨버터를 제어하기 위해, 'D01', 'D02'와 같이 2개의 비트수(n)를 가진 디지털제어신호를 스위칭부(120)로 출력할 수 있다. For example, as shown in FIG. 2 and Table 1 to be described later, the controller 110 may control 'D01' and 'D02' to control the low voltage DC-DC converter through four levels of adjustment voltage VREF. Likewise, the digital control signal having two bits n can be output to the switching unit 120.

스위칭부(120)는 제어부(110)에 의해 출력되는 디지털제어신호(D01,D02)에 대응하여 스위칭되어 전압출력부(130)를 통해 출력되는 조정전압(VREF)을 조절할 수 있다.The switching unit 120 may switch in response to the digital control signals D01 and D02 output by the controller 110 to adjust the adjustment voltage VREF output through the voltage output unit 130.

스위칭부(120)는 디지털제어신호의 비트수(n)에 대응하여 복수 개의 스위칭소자를 구비할 수 있다. 여기서, 스위칭소자는 도 2에 도시된 바와 같이 비트수(n)에 대응하여 2개의 스위칭모스펫(Q1,Q2)으로 마련된다. 스위칭모스펫(Q1,Q2)들 각각은 소스단이 접지되고, 드레인단이 전압출력부(130)에 연결되며, 디지털제어신호(DO1,DO2)에 의해 스위칭된다.The switching unit 120 may include a plurality of switching elements corresponding to the number n of digital control signals. As shown in FIG. 2, the switching elements are provided with two switching MOSFETs Q1 and Q2 corresponding to the number of bits n. Each of the switching MOSFETs Q1 and Q2 has a source terminal grounded, a drain terminal connected to the voltage output unit 130, and switched by the digital control signals DO1 and DO2.

전압출력부(130)는 스위칭부(120)의 스위칭에 대응하여 조정전압(VREF)을 출력하고, 도 1에 도시된 바와 같이 조정전압(VREF)의 출력단(136)에 각각 연결되는 저항모듈(132) 및 구동직류전원(134)을 구비할 수 있다.The voltage output unit 130 outputs the adjustment voltage VREF in response to the switching of the switching unit 120, and as illustrated in FIG. 1, the resistor module connected to the output terminal 136 of the adjustment voltage VREF, respectively. 132 and a driving DC power source 134 may be provided.

저항모듈(132)은 디지털제어신호의 비트수(n) 보다 1개 많은 저항소자들로 이루어질 수 있다. 도 1에 도시된 바와 같이 3개의 저항소자(R20,R21,R22)들과 구동직류전원(134)이 병렬로 연결되며, 저항모듈(132) 중 하나를 제외한 'R21', 'R22' 각각의 타단이 스위칭모스펫(Q1,Q2)들 각각의 드레인단에 연결되며, 제외된 저항소자(R20)의 타단은 접지된다.The resistor module 132 may be composed of one or more resistor elements than the number n of digital control signals. As shown in FIG. 1, three resistor elements R20, R21, and R22 and a driving DC power source 134 are connected in parallel, and each of R21 and R22 except for one of the resistor modules 132 is connected. The other end is connected to the drain end of each of the switching MOSFETs Q1 and Q2, and the other end of the excluded resistor R20 is grounded.

이와 같이 전압출력부(130)의 출력단(136)을 통해 출력되는 조정전압(VREF)은 다음 표 1에 나타난 바와 같이, 스위칭부(120)의 스위칭에 의해 변경되는 저항모듈(132)의 합산된 전체 저항값에 의해 정해질 수 있다.As such, the adjustment voltage VREF output through the output terminal 136 of the voltage output unit 130 is summed up by the resistance module 132 changed by the switching of the switching unit 120, as shown in Table 1 below. It can be determined by the overall resistance value.

Figure pat00001
Figure pat00001

디지털제어신호(DO1,DO2)의 비트수가 'n'인 경우, 조정전압(VREF)의 출력레벨의 종류는 2n개가 된다. 표 1과 같이, 디지털제어신호(DO1,DO2)가 2비트인 경우, 조정전압(VREF)의 출력레벨은 4개가 된다. 따라서 저전압 DC-DC컨버터의 출력전압은 이 조정전압(VREF)에 의해 4 개의 레벨로 조절될 수 있다.When the number of bits of the digital control signals DO1 and DO2 is 'n', the type of output level of the adjustment voltage VREF is 2 n . As shown in Table 1, when the digital control signals DO1 and DO2 are two bits, the output levels of the adjustment voltage VREF are four. Therefore, the output voltage of the low voltage DC-DC converter can be adjusted to four levels by this adjustment voltage VREF.

이와 같이 본 실시예에 따른 저전압 DC-DC컨버터의 출력전압조절장치(100)는 출력전압의 조정을, 종래 사용되는 DAC 및 OP앰프와 같은 능동 IC소자를 대신하여 스위칭모스펫(Q1,Q2)과 저항모듈(132)을 이용하여 구현함으로써 레이아웃을 단순화할 수 있고, 제조단가를 낮출 수 있다.As described above, the output voltage adjusting device 100 of the low-voltage DC-DC converter according to the present embodiment adjusts the output voltage and replaces the switching MOSFETs Q1 and Q2 in place of active IC elements such as DACs and OP amplifiers. By using the resistor module 132, the layout may be simplified, and manufacturing costs may be reduced.

100: 저전압 DC-DC컨버터의 출력전압조절장치
110: 제어부
120: 스위칭부
130: 전압출력부
132: 저항모듈
134: 구동직류전원
136: 출력단100: output voltage regulator of low voltage DC-DC converter
110: control unit
120: switching unit
130: voltage output unit
132: resistance module
134: driving DC power
136: output stage

Claims (5)

입력된 조정전압에 대응하여 출력전압이 조절되는 저전압 DC-DC컨버터의 출력전압조절장치에 있어서,
상기 조정전압을 제어하기 위한 디지털제어신호를 생성하여 출력하는 제어부;
상기 제어부에 의해 출력된 디지털제어신호에 대응하여 스위칭되는 스위칭부; 및
상기 스위칭부의 스위칭에 대응하여 상기 조정전압을 출력하는 전압출력부;를
포함하는 것을 특징으로 하는 저전압 DC-DC컨버터의 출력전압조절장치.In the output voltage regulator of a low voltage DC-DC converter in which the output voltage is adjusted in response to the input adjustment voltage,
A controller for generating and outputting a digital control signal for controlling the adjustment voltage;
A switching unit which is switched in response to the digital control signal output by the control unit; And
A voltage output unit configured to output the adjustment voltage in response to switching of the switching unit;
Output voltage control device for a low-voltage DC-DC converter comprising a. 제1항에 있어서,
상기 제어부는, 디지털제어신호가 상기 조정전압의 출력레벨에 대응하여 신호의 비트수(n)가 정해지는 것을 특징으로 하는 저전압 DC-DC컨버터의 출력전압조절장치.The method of claim 1,
The control unit is an output voltage adjusting device for a low-voltage DC-DC converter, characterized in that the number of bits (n) of the signal is determined in accordance with the digital control signal corresponding to the output level of the adjustment voltage. 제1항에 있어서,
상기 제어부는, 디지털제어신호가 상기 조정전압의 출력레벨에 대응하여 신호의 비트수(n)가 정해지고,
상기 스위칭부는, 상기 비트수(n)에 대응하는 스위칭소자를 구비하는 것을 특징으로 하는 저전압 DC-DC컨버터의 출력전압조절장치.The method of claim 1,
The control unit is configured to determine the number of bits n of the signal in response to the digital control signal output level of the adjustment voltage.
And the switching unit comprises a switching element corresponding to the number of bits (n). 제1항에 있어서,
상기 제어부는, 디지털제어신호가 상기 조정전압의 출력레벨에 대응하여 신호의 비트수(n)가 정해지고,
상기 스위칭부는, 상기 디지털제어신호의 비트수(n)에 대응하여 복수 개로 구비되고 상기 디지털제어신호에 의해 스위칭되는 스위칭모스펫들을 구비하고, 상기 스위칭모스펫들 각각은 소스단이 접지되고 드레인단이 상기 전압출력부에 연결되는 것을 특징으로 하는 저전압 DC-DC컨버터의 출력전압조절장치.The method of claim 1,
The control unit is configured to determine the number of bits n of the signal in response to the digital control signal output level of the adjustment voltage.
The switching unit may include a plurality of switching MOSFETs corresponding to the number of bits n of the digital control signal and switched by the digital control signal, each of the switching MOSFETs having a source terminal grounded and a drain terminal connected to the digital switching signal. Output voltage regulator of the low-voltage DC-DC converter, characterized in that connected to the voltage output. 제4항에 있어서,
상기 전압출력부는 상기 조정전압의 출력단에 각각 연결되는 저항모듈 및 구동직류전원을 구비하고,
상기 저항모듈은 상기 비트수(n) 보다 1개 많은 저항소자들을 구비하고, 상기 저항소자들 각각의 일단이 상기 출력단에 연결되고 상기 저항소자들 중 하나를 제외한 각각의 타단이 상기 스위칭모스펫들 각각의 드레인단에 연결되며, 상기 제외된 저항소자의 타단이 접지되는 것을 특징으로 하는 저전압 DC-DC컨버터의 출력전압조절장치.5. The method of claim 4,
The voltage output unit includes a resistor module and a driving DC power source connected to the output terminal of the adjustment voltage, respectively.
The resistance module includes one or more resistance elements than the number of bits n, one end of each of the resistance elements is connected to the output terminal, and the other end of each of the switching MOSFETs except for one of the resistance elements is respectively formed. Connected to the drain terminal of the output terminal of the low-voltage DC-DC converter, characterized in that the other end of the excluded resistance element is grounded.
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