CN101931386B - 脉宽调制控制系统 - Google Patents

脉宽调制控制系统 Download PDF

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CN101931386B
CN101931386B CN200910303445.6A CN200910303445A CN101931386B CN 101931386 B CN101931386 B CN 101931386B CN 200910303445 A CN200910303445 A CN 200910303445A CN 101931386 B CN101931386 B CN 101931386B
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pulse
signal
phase
control system
modulation control
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CN101931386A (zh
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陈世涛
洪祥睿
黄圣钟
吴坤隆
李诣斌
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • 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
    • H02M3/1584—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 with a plurality of power processing stages connected in parallel
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • 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
    • H02M3/1584—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 with a plurality of power processing stages connected in parallel
    • H02M3/1586—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 with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved

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

Abstract

一种脉宽调制控制系统，包括一第一脉宽调制控制器及一第二脉宽调制控制器，所述第一脉宽调制控制器输出多相位的脉宽调制信号，所述第二脉宽调制控制器输出单相位的脉宽调制信号，所述单相位的脉宽调制信号与所述多相位的脉宽调制信号之间的相位差大于0度，小于180度。本发明脉宽调制控制系统的各脉宽调制控制器输出的脉宽调制信号的相位差排配优化，便于实际应用。

Description

脉宽调制控制系统
技术领域
本发明涉及一种脉宽调制控制系统，特别是一种多相位脉宽调制控制系统。
背景技术
目前，许多主板上CPU的供电电路均采用如图1所示的四相供电电路，利用一PWM(Pulse-Width Modulation，脉宽调制)控制器芯片输出四路PWM信号，每一路PWM信号通过一个驱动IC(Integrated Circuit，集成电路)控制一对MOSFET(场效应管)的导通、断开以调整电压输出。多相供电相较于传统的单相供电具有以下优点：首先是为负载提供足够可靠的电能；其次由于各MOSFET管按照一定的相位顺序轮流导通，使得每路MOSFET管的负担减轻，从而降低了供电电路的温度，使主板运行更加稳定。
为防止所述四相供电电路不能正常工作，导致CPU在电脑运行时突然断电，造成数据丢失等不良后果，业界还提供一个或多个备份用的单相供电电路，在所述四相供电电路不能正常工作时，单相供电电路可给CPU供电，提高给CPU供电的稳定性和可靠性。
所述四相供电电路输出的脉宽调制信号PWM1与两个单相供电电路输出的脉宽调制信号PWM2、PWM3的时序图如图2所示，PWM1信号分四个相位信号(Phase1、Phase2、Phase3、Phase4)，Phase1、Phase2、Phase3、Phase4的脉冲以相同的时间间隔(一个周期)依次出现；PWM2及PWM3信号为单相位信号，PWM2或PWM3信号的一个脉冲插入PWM1信号的一个周期正中间，与PWM1信号的相位差为180度，这种相位差可以使脉冲均匀排列，能有效平均在各时段对输入电容的充放电，且PWM1的纹波电流与PWM2及PWM3的纹波电流无重叠现象，因此不会加剧总的纹波电流的幅度。但是，此种相位排配的电路不易搭配其它控制回路，实际应用时比较困难，且在PWM1信号的一个周期内只能插入一个PWM2或PWM3信号的脉冲，无法进一步提高脉冲频率。
发明内容
鉴于以上内容，有必要提供一种优化相位排配的脉宽调制控制系统。
一种脉宽调制控制系统，包括一第一脉宽调制控制器及一第二脉宽调制控制器，所述第一脉宽调制控制器输出多相位的脉宽调制信号，所述第二脉宽调制控制器输出单相位的脉宽调制信号，所述单相位的脉宽调制信号与所述多相位的脉宽调制信号之间的相位差大于0度，小于180度。
相较于现有技术，本发明脉宽调制控制系统的第二脉宽调制控制器输出脉宽调制信号与所述第一脉宽调制控制器输出的脉宽调制信号之间的相位差小于180度，便于实际应用，且可在所述多相位的脉宽调制信号的一个周期内插入多个所述单相位的脉宽调制信号，可提高脉冲频率。
附图说明
图1是一四相供电电路的示意图。
图2是一传统供电电路中PWM信号及纹波电流的时序图。
图3是本发明较佳实施方式脉宽调制控制系统的示意图。
图4是本发明较佳实施方式脉宽调制控制系统中PWM信号及纹波电流的时序图。
图5是本发明较佳实施方式脉宽调制控制系统中PWM控制器连接关系的示意图。
具体实施方式
请参阅图3及图4，本发明脉宽调制控制系统较佳实施方式包括由三个PWM控制器发出的PWM1、PWM2、PWM3信号，各PWM控制器共接一输入端(如一驱动电源)。PWM1信号包括四个相位的信号Phase1、Phase2、Phase3及Phase4，可控制输出适当的电压至主板上的负载(如CPU等)。PWM2及PWM3信号为单相信号，也可控制输出适当的电压至主板上的负载。PWM2信号的脉冲稍滞后于PWM1的Phase1信号的脉冲，PWM2信号与PWM1信号之间的相位差大于0，小于180度。PWM3的脉冲稍滞后于PWM1的Phase2信号的脉冲，PWM3信号与PWM1信号之间的相位差大于0，小于180度。PWM1信号的脉冲频率4倍于所述PWM2信号与PWM3信号的脉冲频率。
由于PWM2信号及PWM3信号与PWM1信号之间的相位差小于180度，因此在PWM1脉冲信号的一个周期内可插入多个PWM2信号或PWM3信号的脉冲。如PWM2信号或PWM3信号与PWM1信号之间的相位差为60度时，可在PWM1脉冲信号的一个周期内均匀插入5个PWM2信号或PWM3信号的脉冲，使PWM信号的脉冲频率提高。
请参阅图5，本发明脉宽调制控制系统的较佳实施方式包括一第一PWM控制器10及一第二PWM控制器20。所述第一PWM控制器10包括一第一放大器12、一第二放大器14、一相移功能模组16及一驱动IC1 18。每一放大器均包括两个输入端及一个输出端。所述第一放大器12的一输入端接入反馈信号(FB)，与所述负载(如CPU等)的供电电路的电压输出端相连，以监测输出至负载的电压是否在正常的范围内，所述第一放大器12的另一输入端接入一参考电压信号(Vref)。所述第二放大器14的一输入端与所述第一放大器12的输出端相连并接入一补偿信号(COMP)，所述第二放大器14的另一输入端与所述相移功能模组16的输出端相连，所述第二放大器14的输出端与所述驱动IC1 18的输入端相连。所述相移功能模组16包括一延时模组及一振荡器。所述驱动IC1 18包括三个输出引脚H/S Gate、L/S Gate及Phase，H/SGate、L/S Gate引脚分别控制一对MOSFET的导通、断开以调整输出至主板负载的电压，Phase引脚与负载前的一LC滤波器(见图1，如电感L1及电容C1组成的滤波器)相连。所述第一PWM控制器10还包括一与所述相移功能模组16的输入端相连的通话引脚(Talk Pin)。
所述第一放大器12、第二放大器14、移相功能模组16及驱动IC1 18可集成于一芯片内，所述芯片包括一对开关驱动引脚(H/S Gate、L/S Gate)，分别驱动一对MOSFET。所述驱动IC1 18亦可外置与所述芯片以外，所述芯片的一PWM信号输出引脚与所述驱动IC1 18的输入端相连。
所述第二PWM控制器20包括一第一放大器22、一第二放大器24、一相移功能模组26及一驱动IC1 28，其连接关系与所述第一PWM控制器相同。所述第一PWM控制器10的Phase引脚与所述第二PWM控制器20的通话引脚(Talk Pin)相连。所述PWM1信号的一相输出phase 1(或Phase 2、Phase3、Phase4)信号可通过所述第一PWM控制器10的Phase引脚输出至所述第二PWM控制器20的通话引脚(Talk Pin)，PWM1信号通过所述第二PWM控制器20的相移功能模组26发生相位偏移(如滞后60度)，使所述第二PWM控制器20输出所述PWM2脉冲信号(与PWM1信号相位差为60度)。控制输出所述PWM3信号的PWM控制器亦可通过其通话引脚(Talk Pin)与所述第一PWM控制器10连接，以此类推，可实现多个PWM控制器的通讯连接，各PWM控制器并接至负载，如此可保持输出电压不变，而输出至负载的电流增大，能满足CPU等元件工作电流日益增大的需要。

Claims (10)

1.一种脉宽调制控制系统，包括一第一脉宽调制控制器及一第二脉宽调制控制器，所述第一脉宽调制控制器输出多相位的脉宽调制信号，所述第二脉宽调制控制器输出单相位的脉宽调制信号，其特征在于：所述单相位的脉宽调制信号与所述多相位的脉宽调制信号之间具有一相位差，所述相位差大于0度，小于180度，以允许在每一周期的多相位的脉宽调制信号之间插入一个或多个单相位的脉宽调制信号；所述第一脉宽调制控制器及第二脉宽调制控制器包括可使所述多相位的脉宽调制信号及单相位的脉宽调制信号之间具有所述相位差的相移功能模组。
2.如权利要求1所述的脉宽调制控制系统，其特征在于：所述多相位的脉宽调制信号分四相，所述多相位的脉宽调制信号的脉冲频率是所述单相位的脉宽调制信号的四倍。
3.如权利要求1所述的脉宽调制控制系统，其特征在于：所述单相位的脉宽调制信号与所述多相位的脉宽调制信号之间的相位差为60度。
4.如权利要求3所述的脉宽调制控制系统，其特征在于：在所述多相位的脉宽调制信号的一个脉冲周期内有5个均匀排列的单相位的脉宽调制信号的脉冲。
5.如权利要求1所述的脉宽调制控制系统，其特征在于：所述相移功能模组包括一延时模组及一振荡器。
6.如权利要求1所述的脉宽调制控制系统，其特征在于：所述第一脉宽调制控制器的一输出端与所述第二脉宽调制控制器的相移功能模组相连。
7.如权利要求6所述的脉宽调制控制系统，其特征在于：所述第一脉宽调制控制器包括一相位信号输出引脚，其与所述第二脉宽调制控制器的相移功能模组相连。
8.如权利要求7所述的脉宽调制控制系统，其特征在于：所述脉宽调制控制系统还包括一第三脉宽调制控制器，所述第一脉宽调制控制器的相位信号输出引脚与所述第三脉宽调制控制器的相移功能模组相连。
9.如权利要求1所述的脉宽调制控制系统，其特征在于：每一脉宽调制控制器包括一第一放大器、一第二放大器及一驱动模组，所述第一放大器的输出端与所述第二放大器的一输入端相连，所述相移功能模组与所述第二放大器的另一输入端相连，所述第二放大器的输出端与所述驱动模组的输入端相连。
10.如权利要求9所述的脉宽调制控制系统，其特征在于：所述第一放大器的一输入端接有反馈信号以监测输出至负载的电压，另一输入端接一参考电压信号。
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