CN105634266A - 直流-直流转换器的控制电路 - Google Patents

直流-直流转换器的控制电路 Download PDF

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CN105634266A
CN105634266A CN201610155979.9A CN201610155979A CN105634266A CN 105634266 A CN105634266 A CN 105634266A CN 201610155979 A CN201610155979 A CN 201610155979A CN 105634266 A CN105634266 A CN 105634266A
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converter
voltage
error amplifier
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output terminal
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CN105634266B (zh
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曹丹
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0275—Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本发明提供一种直流-直流转换器的控制电路，包括：误差放大器和振荡器；还包括乘法器及分压电路；所述乘法器的第一输入端接收直流-直流转换器的输出端的输出电压通过所述分压电路得到的反馈电压，所述乘法器的第二输入端接收参数补偿值；所述乘法器的输出端连接到误差放大器的第一输入端，所述误差放大器的第二输入端接收参考电压；所述误差放大器的输出端连接到所述振荡器的输入端，以将所述误差放大器的输出提供给所述振荡器；所述振荡器的输出端将频率与所述误差放大器的输出成正比的信号输出到所述直流-直流转换器的开关驱动模块。所述直流-直流转换器的控制电路有效缩短响应时间，瞬态变快，显著提升系统的稳定性。

Description

直流-直流转换器的控制电路
技术领域
本发明总体说来涉及液晶显示器驱动电路的技术领域，更具体地讲，涉及一种直流-直流转换器的控制电路。
背景技术
直流-直流转换器(DC-DCconverter)多为电流控制模式，所谓电流控制模式，就是在脉宽比较器的输入端将电流采样信号与误差放大器的输出信号进行比较，以此来控制输出脉冲的占空比，使输出的峰值电流跟随误差电压变化。目前，电流控制模式DC-DC转换器在采样输出电压信号的同时，电路同样对电感上的电流信号进行采集；跨导转换器(GM)接收输出电压的反馈电压与参考电压，并输出处理结果至比较器的反相输入端；电流侦测电路与三角波产生电路求和后的结果输出至比较器的同相输入端，比较器输出一个驱动信号用于控制功率管的开启与关断。因为跨导转换器需要环路补偿，导致输入和输出之间多一级相位延迟，导致响应时间变长，从而瞬态变慢，最终影响系统稳定性。
发明内容
本发明的目的在于提供一种新型的直流-直流转换器的控制电路，有效解决现有的电流控制模式直流-直流转换器因输入与输出之间多一级相位延迟导致的响应时间变长、瞬态变慢、影响系统稳定性的技术问题。
为实现上述发明目的，本发明提供一种直流-直流转换器的控制电路，包括：误差放大器、振荡器；所述误差放大器的第一输入端接收反馈电压，所述误差放大器的第二输入端接收参考电压；所述误差放大器的输出端连接到所述振荡器的输入端，以将所述误差放大器的输出提供给所述振荡器；所述振荡器的输出端将频率与所述误差放大器的输出成正比的信号输出到所述直流-直流转换器的开关驱动模块，以控制开关驱动模块的充放电时间。
还包括乘法器，所述误差放大器的第一输入端经由所述乘法器接收所述反馈电压，其中，所述乘法器的第一输入端接收所述反馈电压，所述乘法器的第二输入端接收参数补偿值；所述乘法器的输出端连接到所述误差放大器的第一输入端。
所述参数补偿值为所述直流-直流转换器的输出端的预期电压值的补偿值；所述参数补偿值由直流-直流转换器的集成电路中电压补偿模块计算得到；不同的直流-直流转换器的输出端的预期电压值对应的参数补偿值也不同，所述参数补偿值与所述预期电压值成反比。
所述参数补偿值小于1。
所述振荡器输出端的信号的频率与所述开关驱动模块的放电时间成反比。
所述直流-直流转换器的开关驱动模块通过储能模块连接到所述直流-直流转换器的输出端。
所述直流-直流转换器的控制电路还包括分压电路，所述反馈电压为直流-直流转换器输出端的输出电压通过分压电路得到的分压值。
所述参考电压大于所述反馈电压。
所述分压电路包括第一电阻器和第二电阻器；所述第一电阻器R1和第二电阻器R2中的至少一个为可变电阻器。
所述开关驱动模块包括驱动器、用于对所述直流-直流转换器的储能模块的充电进行控制的第一开关及用于对所述储能模块的放电进行控制的第二开关；所述驱动器根据振荡器的输出端输出的信号控制第一开关和第二开关的导通状态，其中，所述第一开关与第二开关的导通状态相反。
所述误差放大器的第一输入端为反相输入端，所述误差放大器的第二输入端为同相输入端。
所述频率与所述误差放大器的输出成正比的信号为矩形波信号。
本发明提供一种直流-直流转换器的控制电路，通过误差放大器与振荡器，使直流-直流转换器输出端的输出电压达到预期电压值并保持稳定；当需要改变直流-直流转换器的输出端的预期电压值时，通过设置乘法器接收反馈电压，然后将其与参数补偿值相乘后得到乘法器输出端的输出电压；误差放大器根据所述乘法器输出端的输出电压与参考电压产生的放大信号，决定振荡器输出信号的频率，所述频率决定开关驱动模块的周期性工作状态，最终使所述直流-直流转换器输出端的输出电压达到改变后的预期电压值并保持稳定。所述控制电路有效缩短响应时间，从而瞬态变快，显著提升系统稳定性。
附图说明
图1示出本发明实施例的直流-直流转换器的控制电路的示意图。
图2示出图1的控制电路一个具体示例。
图3示出本发明的另一实施例的控制电路。
具体实施方式
图1示出本发明实施例的直流-直流转换器的控制电路的示意图。
参照图1，本发明的实施例中提出一种直流-直流转换器的控制电路100，包括：误差放大器EA、振荡器110。
误差放大器EA的反相输入端接收来自直流-直流转换器的输出端的输出电压Vcore的反馈电压VFB；误差放大器EA的同相输入端接收参考电压Vref，参考电压Vref小于直流-直流转换器的输出端的输出电压Vcore；误差放大器EA输出端的误差信号△V是参考电压Vref和反馈电压VFB的比较值的处理结果。参考电压Vref大于反馈电压VFB。
振荡器110的输入端接收误差信号△V，振荡器110的输出端将信号输出到直流-直流转换器的开关驱动模块120，以控制开关驱动模块120的充放电时间，进而对直流-直流转换器的输出端的输出电压Vcore进行调控，直至达到预期电压值并保持稳定。
振荡器110输出端的信号的频率与开关驱动模块120的放电时间成反比。
振荡器110输出端的信号的频率与误差信号△V成正比，即：误差信号△V越大对应振荡器输出端的信号的频率越高，误差信号△V越小对应振荡器输出端的信号的频率越小。
直流-直流转换器的控制电路100还包括分压电路130，反馈电压VFB为直流-直流转换器的输出端的输出电压Vcore通过分压电路130得到的分压值。
开关驱动模块120接收输入的直流电压Vin；直流-直流转换器的开关驱动模块120通过储能模块140连接到直流-直流转换器的输出端。
本实施例提供的直流-直流转换器的控制电路100的工作过程为：
开关驱动模块120周期性地交替进行充电和放电。每个充电周期的时间t1是固定的，即，充电时间t1是固定的。而每个放电周期的时间t2根据振荡器输出端的信号的频率而变化。具体地说，放电周期的时间t2与振荡器110输出端的信号的频率成反比，即，振荡器110输出的信号的频率越大，放电周期的时间t2越小，从而整体上放电时间减少。
当直流-直流转换器输出端的输出电压Vcore小于预期电压值时，反馈电压VFB较小，从而误差放大器EA根据反馈电压VFB与参考电压Vref产生的误差信号△V较大。此时，振荡器110输出的信号的频率增大，从而开关驱动模块120接收的信号的周期T减小。相应地，放电周期的时间t2减小。因此，总的放电时间减小，使得直流-直流转换器输出端的输出电压Vcore升高，从而开始接近于预期电压值。
同理，当直流-直流转换器输出端的输出电压Vcore大于预期电压值时，反馈电压VFB较大，从而误差放大器EA产生的误差信号△V较小。此时，振荡器110输出的信号的频率减小，从而开关驱动模块120接收的信号的周期T增大。相应地，放电周期的时间t2增大。因此，总的放电时间增大，使直流-直流转换器输出端的输出电压Vcore下降，从而开始接近于预期电压值。如此多个周期的重复，直至直流-直流转换器输出端的输出电压Vcore达到输出的预期电压值并保持稳定。
图2示出图1的控制电路一个具体示例。
参照图2，分压电路130包括第一电阻器R1和第二电阻器R2；第一电阻器R1的一端连接到第二电阻器R2的一端及乘法器150的第一输入端；第一电阻器R1的另一端连接到直流-直流转换器的输出端，第二电阻器R2的另一端接地。
在一个示例中，第一电阻器R1和第二电阻器R2中的至少一个为可变电阻器。通过调整可变电阻器的阻值实现参考电压Vref大于反馈电压VFB。
开关驱动模块120包括驱动器122(Driver)、用于对直流-直流转换器的储能模块140的充电进行控制的第一开关S1及用于对储能模块140的放电进行控制的第二开关S2；振荡器110的输出端连接到驱动器122；驱动器122通过第一开关S1和第二开关S2连接到储能模块140；储能模块140连接到直流-直流转换器的输出端。
驱动器122根据振荡器110的输出端输出的信号控制第一开关S1和第二开关S2的导通状态，其中，第一开关S1与第二开关S2的导通状态相反，其相位输入端和输出端相反。
振荡器110输出端输出的信号可为矩形波信号。
振荡器110可为压控振荡器。
储能模块140包括电感器L1和电容器C1；电感器L1的一端连接到第一开关S1和第二开关S2；电感器L1的另一端及电容器C1的一端连接到直流-直流转换器的输出端；电容器C1的另一端接地。
第一开关S1和第二开关S2均为场效应晶体管，分别为：第一场效应晶体管Q1和第二场效应晶体管Q2。驱动器122通过第一场效应晶体管Q1和第二场效应晶体管Q2连接到直流-直流转换器的输出端；驱动器122连接到第一场效应晶体管Q1的栅极、第二场效应晶体管Q2的栅极；第一场效应晶体管Q1的源极接收输入的直流电压Vin，第一场效应晶体管Q1的漏极与第二场效应晶体管Q2的漏极连接到电感器L1；第二场效应晶体管的源极Q2接地。
驱动器122接收来自振荡器110输出端的矩形波信号，进而驱动第一场效应晶体管Q1及第二场效应晶体管Q2的导通和截止。第一场效应晶体管Q1为绝缘栅增强型P沟道场效应晶体管；第二场效应晶体管Q2为绝缘栅耗尽型N沟道场效应晶体管。
图3示出本发明的另一实施例的控制电路。
参照图3，与图1所示的控制电路相比，本实施例提供的直流-直流转换器的控制电路100还包括乘法器150，误差放大器EA的第一输入端经由乘法器150接收反馈电压VFB，其中，乘法器150的第一输入端接收来自直流-直流转换器的输出端的输出电压Vcore的反馈电压VFB，乘法器150的第二输入端接收参数补偿值A1；乘法器150输出端的输出电压VA是参数补偿值A1和反馈电压VFB的乘法值。通过乘法器150实现直流-直流转换器输出端的不同预期电压值的输出。
参数补偿值A1为直流-直流转换器的输出端的预期电压值的补偿值，由直流-直流转换器的集成电路IC中的电压补偿模块计算得到。参数补偿值A1小于1。
针对不同的直流-直流转换器的输出端的预期电压值，参数补偿值A1也不同；可通过调整参数补偿值A1实现对直流-直流转换器的输出端的预期电压值进行补偿；参数补偿值A1与直流-直流转换器的输出端的预期电压值成反比，如：直流-直流转换器的输出端的第一预期电压值对应的参数补偿值是a(a＜1)，那么，若第二预期电压值大于第一预期电压值，则第二预期电压值对应的参数补偿值a1(a1＜1)小于a；若第二预期电压值小于第一预期电压值，则第二预期电压值对应的参数补偿值a1(a1＜1)大于a。
误差放大器EA的反相输入端接收乘法器150输出端的输出电压VA；误差放大器EA的同相输入端接收参考电压Vref；误差放大器EA输出端的误差信号△V是参考电压Vref和乘法器150输出端的输出电压VA的比较值的放大结果。
乘法器150的输出电压VA、反馈电压VFB、参考电压Vref、直流-直流转换器输出端的输出电压Vcore的关系为：VA≤VFB＜Vref＜Vcore。由此可见，误差放大器EA输出的误差信号△V为正。
振荡器110的输入端接收误差信号△V，振荡器110的输出端将信号输出到直流-直流转换器的开关驱动模块120。振荡器110输出端的信号的频率与误差信号△V成正比，即误差信号△V越大对应频率越高，误差信号△V越小对应频率越小。
采用上述根据本发明实施例的直流-直流转换器的控制电路，可以有效缩短响应时间，瞬态变快，显著提升系统稳定性。
上面已经结合具体实施例描述了本发明，但是本发明的实施不限于此。在本发明的精神和范围内，本领域技术人员可以进行各种修改和变型，这些修改和变型将落入权利要求限定的保护范围之内。

Claims (10)

1.一种直流-直流转换器的控制电路，其特征在于，包括：误差放大器、振荡器；
所述误差放大器的第一输入端接收反馈电压，所述误差放大器的第二输入端接收参考电压；
所述误差放大器的输出端连接到所述振荡器的输入端，以将所述误差放大器的输出提供给所述振荡器；
所述振荡器的输出端将频率与所述误差放大器的输出成正比的信号输出到所述直流-直流转换器的开关驱动模块，以控制所述开关驱动模块的充放电时间。
2.如权利要求1所述的直流-直流转换器的控制电路，其特征在于，还包括乘法器，所述误差放大器的第一输入端经由所述乘法器接收所述反馈电压，其中，所述乘法器的第一输入端接收所述反馈电压，所述乘法器的第二输入端接收参数补偿值，所述乘法器的输出端连接到所述误差放大器的第一输入端。
3.如权利要求1或2所述的直流-直流转换器的控制电路，其特征在于，还包括分压电路，所述反馈电压为所述直流-直流转换器的输出端的输出电压通过所述分压电路得到的分压值。
4.如权利要求3所述的直流-直流转换器的控制电路，其特征在于，所述参考电压大于所述反馈电压。
5.如权利要求4所述的直流-直流转换器的控制电路，其特征在于，所述分压电路包括第一电阻器和第二电阻器。
6.如权利要求2所述的直流-直流转换器的控制电路，其特征在于，所述参数补偿值为所述直流-直流转换器的输出端的预期电压值的补偿值，不同的预期电压值对应不同的参数补偿值，所述参数补偿值与所述预期电压值成反比。
7.如权利要求6所述的直流-直流转换器的控制电路，其特征在于，所述参数补偿值小于1。
8.如权利要求1或2所述的直流-直流转换器的控制电路，其特征在于，所述开关驱动模块包括驱动器、用于对所述直流-直流转换器的储能模块的充电进行控制的第一开关及用于对所述储能模块的放电进行控制的第二开关；所述驱动器根据振荡器的输出端输出的信号控制第一开关和第二开关的导通状态，其中，所述第一开关与第二开关的导通状态相反。
9.如权利要求1或2所述的直流-直流转换器的控制电路，其特征在于，所述振荡器输出端的信号的频率与所述开关驱动模块的放电时间成反比。
10.如权利要求1或2所述的直流-直流转换器的控制电路，其特征在于，所述频率与所述误差放大器的输出成正比的信号为矩形波信号。
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