技术领域technical field
本发明涉及电压调节技术领域，具体涉及一种可自动调整压差以提高整体转换效率的电源系统。The invention relates to the technical field of voltage regulation, in particular to a power supply system that can automatically adjust the voltage difference to improve the overall conversion efficiency.
背景技术Background technique
在实际的供电应用中，经常需要在DC-DC(direct current-direct current；直流-直流)转换器后级联一个或多个LDO(low dropout；低调节压差)线性稳压器，或者在DC-DC转换器后级联一个或多个电荷泵。参照图1(1-a至1-d))，其中，图1-a所示由DC-DC转换器10级联LDO线性稳压器11所组成的电源管理系统；图1-b所示由DC-DC转换器10级联电荷泵12所组成的电源管理系统；图1-c所示由DC-DC转换器10级联LDO线性稳压器11和电荷泵12所组成的电源管理系统；以及图1-d所示由DC-DC转换器10级联多个LDO线性稳压器11和多个电荷泵12所组成的电源管理系统；其中，LDO线性稳压器11和电荷泵12的输入电压均需要比输出电压高出预定的调节压差(headroom或dropout)才能正常工作。In practical power supply applications, it is often necessary to cascade one or more LDO (low dropout; low regulation dropout) linear regulators after the DC-DC (direct current-direct current; DC-DC) converter, or in One or more charge pumps are cascaded after the DC-DC converter. Referring to Figure 1 (1-a to 1-d)), Figure 1-a shows a power management system composed of DC-DC converters 10 cascaded LDO linear regulators 11; Figure 1-b shows A power management system composed of a DC-DC converter 10 cascading a charge pump 12; the power management system composed of a DC-DC converter 10 cascading an LDO linear regulator 11 and a charge pump 12 as shown in Figure 1-c ; And as shown in FIG. 1-d, a power management system composed of a plurality of LDO linear regulators 11 and a plurality of charge pumps 12 is cascaded by a DC-DC converter 10; wherein, the LDO linear regulator 11 and the charge pump 12 The input voltage needs to be higher than the output voltage by a predetermined regulation dropout (headroom or dropout) to work properly.
如图1-a所示，DC-DC转换器10用于将输入电压Vin转成第一输出电压Vreg，而LDO线性稳压器11则是用于将第一输出电压Vreg转成第二输出电压Vldo，其中Vreg须比Vldo高出预定的调节压差；如图1-b所示，DC-DC转换器10用于将输入电压Vin转成第一输出电压Vreg，而电荷泵12则是用于将第一输出电压Vreg转成第二输出电压Vcp，其中Vreg须比Vcp高出预定的调节压差；如图1-c所示，DC-DC转换器10用于将输入电压Vin转成第一输出电压Vreg，LDO线性稳压器11是用于将第一输出电压Vreg转成第二输出电压Vldo，且电荷泵12是用于将第一输出电压Vreg转成第三输出电压Vcp，其中Vreg须比Vldo高出预定的第一调节压差且须比Vcp高出预定的第二调节压差；以及如图1-d所示，DC-DC转换器10用于将输入电压Vin转成第一输出电压Vreg，各LDO线性稳压器11是用于将第一输出电压Vreg转成第二输出电压Vldoi，i为1到n之间的正整数，且各电荷泵12是用于将第一输出电压Vreg转成第三输出电压Vcpi，i为1到n之间的正整数，其中Vreg须比各Vldoi高出预定的第一调节压差且须比各Vcpi高出预定的第二调节压差，也就是说，Vreg须足够高以确保各LDO线性稳压器11及各电荷泵12均能正常工作。As shown in FIG. 1-a, the DC-DC converter 10 is used to convert the input voltage Vin to the first output voltage Vreg , and the LDO linear regulator 11 is used to convert the first output voltage Vreg to The second output voltage Vldo , where Vreg must be higher than Vldo by a predetermined regulation voltage difference; as shown in FIG. 1-b, the DC-DC converter 10 is used to convert the input voltage Vin into the first output voltage Vreg , and the charge pump 12 is used to convert the first output voltage Vreg into the second output voltage Vcp , where Vreg must be higher than Vcp by a predetermined regulation voltage difference; as shown in FIG. 1-c, DC The DC converter 10 is used to convert the input voltage Vin to the first output voltage Vreg , the LDO linear regulator 11 is used to convert the first output voltage Vreg to the second output voltage Vldo , and the charge pump 12 is used to convert the first output voltage Vreg into a third output voltage Vcp , wherein Vreg must be higher than Vldo by a predetermined first regulation voltage difference and must be higher than Vcp by a predetermined second regulation voltage difference; And as shown in FIG. 1-d, the DC-DC converter 10 is used to convert the input voltageVin into the first output voltage Vreg , and each LDO linear regulator 11 is used to convert the first output voltage Vreg into the first output voltage V reg . The second output voltage Vldoi , i is a positive integer between 1 and n, and each charge pump 12 is used to convert the first output voltage Vreg into the third output voltage Vcpi , where i is between 1 and n A positive integer where Vreg must be higher than each Vldoi by a predetermined first regulation differential and must be higher than each Vcpi by a predetermined second regulation differential, that is, Vreg must be high enough to ensure that each LDO is linear The voltage regulator 11 and each charge pump 12 can work normally.
另外，在电压调节系统中，调节压差一般会根据最大负载条件确定，且调节压差在确定后，在整个工作期间就不会再改变。另外，电压调节系统的复合效率等于DC-DC转换器的效率乘以LDO线性稳压器或者电荷泵的效率，而LDO线性稳压器和电荷泵的理想最大效率η是与调节压差直接相关，该理想最大效率η可表示如下式：In addition, in the voltage regulation system, the regulation pressure difference is generally determined according to the maximum load condition, and after the regulation pressure difference is determined, it will not change during the whole working period. In addition, the compound efficiency of the voltage regulation system is equal to the efficiency of the DC-DC converter multiplied by the efficiency of the LDO linear regulator or charge pump, and the ideal maximum efficiency η of the LDO linear regulator and charge pump is directly related to the regulation dropout , the ideal maximum efficiency η can be expressed as follows:
其中，Vldo为LDO线性稳压器的输出电压，Vdropout为该LDO线性稳压器的调节压差。Wherein, Vldo is the output voltage of the LDO linear regulator, and Vdropout is the regulation voltage drop of the LDO linear regulator.
由上述可知，调节压差Vdropout越大/越小，理想最大效率η就越低/越高。It can be seen from the above that the larger/smaller the adjustment pressure difference Vdropout is, the lower/higher the ideal maximum efficiency η is.
也就是说，现有技术是根据实际应用中的最大负载要求设定调节压差Vdropout，一旦调节压差Vdropout确定后，调节压差Vdropout在整个工作期间保持不变。参见图2所示的关系曲线图，现有电压调节系统在各种负载电流Iload下皆以固定的调节压差Vdp将Vreg转成Vldoi和Vcpi。然而，由于现有电压调节系统在轻载时只需较小的调节压差Vdp即可正常操作，因此，现有电压调节系统采用固定调节压差Vdp的方法在轻载时的电压转换效率较低。That is to say, in the prior art, the adjustment pressure difference Vdropout is set according to the maximum load requirement in practical applications. Once the adjustment pressure difference Vdropout is determined, the adjustment pressure difference Vdropout remains unchanged during the entire working period. Referring to the relationship graph shown in FIG. 2 , the existing voltage regulation system converts Vreg into Vldoi and Vcpi with a fixed regulation voltage difference Vdp under various load currents Iload . However, since the existing voltage regulation system only needs a small regulation voltage difference Vdp to operate normally at light load, the existing voltage regulation system adopts the method of fixing the regulation voltage difference Vdp to convert the voltage at light load less efficient.
为解决上述技术问题，本领域亟需一种新的电压调节系统。To solve the above technical problems, a new voltage regulation system is urgently needed in the art.
发明内容SUMMARY OF THE INVENTION
针对现有技术中的问题，本发明提供一种电压调节系统，实现提高整个电压调节系统在轻载时的整体复合效率。In view of the problems in the prior art, the present invention provides a voltage regulation system, which can improve the overall composite efficiency of the entire voltage regulation system under light load.
为实现上述目的，本发明提供以下技术方案：For achieving the above object, the present invention provides the following technical solutions:
本发明提供了一种电压调节系统，包括：直流-直流转换器和电压调节单元；The invention provides a voltage regulation system, comprising: a DC-DC converter and a voltage regulation unit;
所述直流-直流转换器，包括：切换式电源转换单元和反馈单元；The DC-DC converter includes: a switching power conversion unit and a feedback unit;
所述切换式电源转换单元用于根据反馈信号产生切换信号以使所述切换式电源转换单元将输入电压转换成第一输出电压，The switching power conversion unit is configured to generate a switching signal according to the feedback signal, so that the switching power conversion unit converts the input voltage into the first output voltage,
所述反馈单元用于根据可调分压比例对第一输出电压进行分压操作以产生反馈信号；The feedback unit is configured to perform a voltage division operation on the first output voltage according to an adjustable voltage division ratio to generate a feedback signal;
所述电压调节单元用于将第一输出电压转换为第二输出电压，所述第二输出电压低于所述第一输出电压；the voltage adjustment unit is configured to convert a first output voltage into a second output voltage, where the second output voltage is lower than the first output voltage;
其中，所述切换式电源转换单元，包括：Wherein, the switching power conversion unit includes:
负载电流状态检测单元，用于根据电感电流在预定期间内的过零次数是否超过预定次数确定负载电流状态；若是，则确定负载电流状态为轻载状态，并将所述可调分压比例设为第一比例；若否，则确定负载电流状态为非轻载状态，并将所述可调分压比例设为第二比例，其中，所述第二比例小于所述第一比例。The load current state detection unit is used to determine the load current state according to whether the zero-crossing times of the inductor current in a predetermined period exceeds a predetermined number of times; if so, determine that the load current state is a light load state, and set the adjustable voltage division ratio to is the first ratio; if not, the load current state is determined to be a non-light load state, and the adjustable voltage dividing ratio is set to a second ratio, wherein the second ratio is smaller than the first ratio.
其中，所述电压调节单元为LDO电压调节单元或电荷泵。Wherein, the voltage adjustment unit is an LDO voltage adjustment unit or a charge pump.
其中，所述反馈单元为电阻式串行电路。Wherein, the feedback unit is a resistive serial circuit.
其中，所述预定期间包含多个切换周期。Wherein, the predetermined period includes a plurality of switching cycles.
其中，当所述负载电流状态为轻载状态时，所述切换式电源转换单元工作在脉冲频率调制模式，以及，当所述负载电流状态为非轻载状态时，所述切换式电源转换单元工作在脉冲宽度调制模式。Wherein, when the load current state is a light load state, the switching power conversion unit operates in a pulse frequency modulation mode, and when the load current state is a non-light load state, the switching power conversion unit Operates in pulse width modulation mode.
另一方面，本发明还提供了一种电压调节系统，包括：一个直流-直流转换器和多个电压调节单元；所述直流-直流转换器的输出端分别与多个所述电压调节单元输入端相连接；In another aspect, the present invention also provides a voltage regulation system, comprising: a DC-DC converter and a plurality of voltage regulation units; the output ends of the DC-DC converter are respectively input to the plurality of voltage regulation units end-to-end connection;
所述直流-直流转换器，包括：切换式电源转换单元和反馈单元；The DC-DC converter includes: a switching power conversion unit and a feedback unit;
所述切换式电源转换单元用于根据反馈信号产生切换信号以使所述切换式电源转换单元将输入电压转换成第一输出电压，The switching power conversion unit is configured to generate a switching signal according to the feedback signal, so that the switching power conversion unit converts the input voltage into the first output voltage,
所述反馈单元用于根据可调分压比例对第一输出电压进行分压操作以产生反馈信号；The feedback unit is configured to perform a voltage division operation on the first output voltage according to an adjustable voltage division ratio to generate a feedback signal;
每个所述电压调节单元均用于将第一输出电压转换为第二输出电压，所述第二输出电压低于所述第一输出电压；Each of the voltage adjustment units is configured to convert a first output voltage into a second output voltage, where the second output voltage is lower than the first output voltage;
其中，所述切换式电源转换单元，包括：Wherein, the switching power conversion unit includes:
负载电流状态检测单元，用于根据电感电流在预定期间内的过零次数是否超过预定次数确定负载电流状态；若是，则确定负载电流状态为轻载状态，并将所述可调分压比例设为第一比例；若否，则确定负载电流状态为非轻载状态，并将所述可调分压比例设为第二比例，其中，所述第二比例小于所述第一比例。The load current state detection unit is used to determine the load current state according to whether the zero-crossing times of the inductor current in a predetermined period exceeds a predetermined number of times; if so, determine that the load current state is a light load state, and set the adjustable voltage division ratio to is the first ratio; if not, the load current state is determined to be a non-light load state, and the adjustable voltage dividing ratio is set to a second ratio, wherein the second ratio is smaller than the first ratio.
其中，所述电压调节单元为LDO电压调节单元或电荷泵。Wherein, the voltage adjustment unit is an LDO voltage adjustment unit or a charge pump.
其中，所述反馈单元为电阻式串行电路。Wherein, the feedback unit is a resistive serial circuit.
其中，所述预定期间包含多个切换周期。Wherein, the predetermined period includes a plurality of switching cycles.
其中，当所述负载电流状态为轻载状态时，所述切换式电源转换单元工作在脉冲频率调制模式，以及，当所述负载电流状态为非轻载状态时，所述切换式电源转换单元工作在脉冲宽度调制模式。Wherein, when the load current state is a light load state, the switching power conversion unit operates in a pulse frequency modulation mode, and when the load current state is a non-light load state, the switching power conversion unit Operates in pulse width modulation mode.
由上述技术方案可知，本发明所述的一种电压调节系统，可根据负载的大小适时地调整调节压差(dropout)的大小，优化电压调解系统中LDO及/或电荷泵在轻载时的效率，从而提高整个电压调解系统在轻载时的整体复合效率；还能够在轻载时调高系统中直流-直流转换器的电压反馈系数以调降直流-直流转换器的输出电压，从而降低调节压差(dropout)优化系统中之LDO及/或电荷泵在轻载时的效率，提高整个系统在轻载时的整体复合效率。It can be known from the above technical solutions that the voltage regulation system of the present invention can adjust the size of the dropout in time according to the size of the load, so as to optimize the LDO and/or the charge pump in the voltage regulation system when the load is light. efficiency, thereby improving the overall composite efficiency of the entire voltage regulation system at light load; it can also increase the voltage feedback coefficient of the DC-DC converter in the system at light load to reduce the output voltage of the DC-DC converter, thereby reducing Adjusting the dropout optimizes the efficiency of the LDO and/or the charge pump in the system at light loads, improving the overall composite efficiency of the entire system at light loads.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.
图1为现有技术中电源管理系统的结构示意图；1 is a schematic structural diagram of a power management system in the prior art;
其中，图1-a为DC-DC转换器级联LDO线性稳压器组成的电源管理系统的结构示意图；Among them, Figure 1-a is a schematic structural diagram of a power management system composed of a DC-DC converter cascaded LDO linear regulators;
图1-b为DC-DC转换器级联电荷泵组成的电源管理系统的结构示意图；Figure 1-b is a schematic structural diagram of a power management system composed of a DC-DC converter cascaded charge pump;
图1-c为DC-DC转换器级联LDO线性稳压器和电荷泵组成的电源管理系统的结构示意图；Figure 1-c is a schematic structural diagram of a power management system composed of a DC-DC converter cascaded LDO linear regulators and a charge pump;
图1-d为一个DC-DC转换器级联多个LDO线性稳压器和多个电荷泵组成的电源管理系统的结构示意图；Figure 1-d is a schematic structural diagram of a power management system composed of a DC-DC converter cascaded with multiple LDO linear regulators and multiple charge pumps;
图2为现有技术中电压调节系统在各种负载电流下皆以一固定的调节压差将第一输出电压转成第二输出电压的关系曲线图；2 is a graph showing the relationship between the voltage regulation system in the prior art and the conversion of the first output voltage into the second output voltage with a fixed regulation voltage difference under various load currents;
图3为本发明实施例提供的电压调节系统的结构示意图；FIG. 3 is a schematic structural diagram of a voltage regulation system provided by an embodiment of the present invention;
图4为本发明实施例提供的电压调节系统中切换式电源转换单元的结构示意图；4 is a schematic structural diagram of a switching power conversion unit in a voltage regulation system provided by an embodiment of the present invention;
图5为本发明实施例提供的电压调节系统中反馈单元的结构示意图；5 is a schematic structural diagram of a feedback unit in a voltage regulation system provided by an embodiment of the present invention;
其中，图5-a为一种反馈单元的结构示意图；图5-b为另一种反馈单元的结构示意图；Wherein, FIG. 5-a is a schematic structural diagram of a feedback unit; FIG. 5-b is a structural schematic diagram of another feedback unit;
图6为本发明实施例提供的另一种电压调节系统的结构示意图；FIG. 6 is a schematic structural diagram of another voltage regulation system provided by an embodiment of the present invention;
图7为本发明实施例提供的电压调节系统中调节压差和负载电流的关系图；FIG. 7 is a relationship diagram between a voltage regulation difference and a load current in a voltage regulation system provided by an embodiment of the present invention;
其中，10-DC-DC转换器，11-LDO线性稳压器，12-电荷泵，100-直流-直流转换器，101-切换式电源转换单元，101a-切换信号产生单元，101b-电能传输单元，101c负载电流状态检测单元，102-反馈单元，102a-第一电阻，102b-可变电阻，102c-第二电阻，102d-第三电阻，102e-第四电阻，102f-第五电阻，110-电压调节单元。Among them, 10-DC-DC converter, 11-LDO linear regulator, 12-charge pump, 100-DC-DC converter, 101-switching power conversion unit, 101a-switching signal generating unit, 101b-power transmission unit, 101c load current state detection unit, 102-feedback unit, 102a-first resistor, 102b-variable resistor, 102c-second resistor, 102d-third resistor, 102e-fourth resistor, 102f-fifth resistor, 110 - Voltage regulation unit.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整的描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
本发明实施例提供的一种电压调节系统，参见图3，包括：直流-直流转换器100和电压调节单元110；A voltage regulation system provided by an embodiment of the present invention, referring to FIG. 3 , includes: a DC-DC converter 100 and a voltage regulation unit 110;
直流-直流转换器100，包括：切换式电源转换单元101和反馈单元102；The DC-DC converter 100 includes: a switching power conversion unit 101 and a feedback unit 102;
切换式电源转换单元101用于根据反馈信号FB产生切换信号以使切换式电源转换单元101将输入电压VIN转换成第一输出电压VREG；The switching power conversion unit 101 is configured to generate a switching signal according to the feedback signal FB, so that the switching power conversion unit 101 converts the input voltage VIN into the first output voltage VREG ;
反馈单元102用于根据可调分压比例对第一输出电压VREG进行分压操作以产生反馈信号FB；The feedback unit 102 is configured to perform a voltage division operation on the first output voltage VREG according to the adjustable voltage division ratio to generate a feedback signal FB;
电压调节单元110为LDO电压调节单元或电荷泵，用于将第一输出电压VREG转换为第二输出电压VOUT，第二输出电压VOUT低于第一输出电压VREG；其中，第一输出电压VREG与第二输出电压VOUT之间的压差大于预定的调节压差。The voltage adjustment unit 110 is an LDO voltage adjustment unit or a charge pump, and is used to convert the first output voltage VREG into a second output voltage VOUT , and the second output voltage VOUT is lower than the first output voltage VREG ; The voltage difference between the output voltage VREG and the second output voltage VOUT is greater than a predetermined regulation voltage difference.
进一步的，本发明实施例提供了上述实施方式中切换式电源转换单元的结构示意图，参见图4，切换式电源转换单元101，包括：Further, the embodiment of the present invention provides a schematic structural diagram of the switching power conversion unit in the above embodiment. Referring to FIG. 4 , the switching power conversion unit 101 includes:
切换信号产生单元101a、电能传输单元101b和负载电流状态检测单元101c，其中，切换信号产生单元101a用于根据反馈信号FB产生切换信号SW以驱动电能传输单元101b，从而将电能由电能传输单元101b的输入端传至电能传输单元101b的输出端；负载电流状态检测单元101c用于根据电感电流的感测信号SLI判断该电感电流在预定期间内(也就是说，在切换信号的预定数目个切换周期内)的过零次数是否超过预定次数，以确定负载电流信号SLD的状态，The switching signal generating unit 101a, the power transmission unit 101b and the load current state detection unit 101c, wherein the switching signal generating unit 101a is used to generate the switching signal SW according to the feedback signal FB to drive the power transmission unit 101b, so as to transfer the power from the power transmission unit 101b to the power transmission unit 101b. The input terminal of the inductor current is transmitted to the output terminal of the power transmission unit 101b; the load current state detection unit 101c is used to determine that the inductor current is within a predetermined period according to the sensing signalSLI of the inductor current (that is, within a predetermined number of switching signals). Whether the number of zero crossings in the switching cycle) exceeds a predetermined number to determine the state of the load current signal SLD ,
若是，则确定该负载电流信号SLD为轻载状态，并将该可调分压比例设为第一比例，若否，则确定该负载电流信号SLD为非轻载状态，并将该可调分压比例设为第二比例，其中，第二比例小于第一比例。另外，负载电流信号SLD可为数字信号或模拟信号。If yes, then determine that the load current signal SLD is in a light load state, and set the adjustable voltage division ratio as the first ratio; if not, determine that the load current signal SLD is in a non-light load state, and set the adjustable voltage division ratio The voltage dividing ratio is set as a second ratio, wherein the second ratio is smaller than the first ratio. In addition, the load current signal SLD may be a digital signal or an analog signal.
进一步的，参见图5，本发明实施例提供了上述实施方式中反馈单元的结构示意图。Further, referring to FIG. 5 , an embodiment of the present invention provides a schematic structural diagram of the feedback unit in the foregoing embodiment.
在一个实施方式中，参见图5-a，反馈单元102包括：依次串联的第一电阻102a、可变电阻102b和第二电阻102c，其中，可变电阻102b是根据负载电流信号SLD的控制确定电阻值：当负载电流信号SLD呈现为轻载状态时，可变电阻102b会处于低电阻值以将该可调分压比例设为该第一比例；当该负载电流信号SLD呈现为非轻载状态时，可变电阻102b会处于高电阻值以将该可调分压比例设为该第二比例。In one embodiment, referring to FIG. 5-a, the feedback unit 102 includes: a first resistor 102a, a variable resistor 102b and a second resistor 102c connected in series in sequence, wherein the variable resistor 102b is controlled according to the load current signal SLD Determining the resistance value: when the load current signal SLD is in a light load state, the variable resistor 102b will be in a low resistance value to set the adjustable voltage dividing ratio to the first ratio; when the load current signal SLD is in a state of In a non-light load state, the variable resistor 102b will be at a high resistance value to set the adjustable voltage dividing ratio to the second ratio.
在另一个实施方式中，参见图5-b，反馈单元102包括：依次串联的第三电阻102d、第四电阻102e和第五电阻102f，负载电流信号SLD会从反馈单元102抽出电流ISEN，其中，当该负载电流信号SLD呈现为轻载状态时，电流ISEN处于低电流值，以使可调分压比例为第一比例；当该负载电流信号SLD呈现为非轻载状态时，电流ISEN处于高电流值以使可调分压比例为该第二比例。In another embodiment, referring to FIG. 5-b, the feedback unit 102 includes: a third resistor 102d, a fourth resistor 102e and a fifth resistor 102f connected in series in sequence, the load current signal SLD will draw the currentISEN from the feedback unit 102 , wherein, when the load current signal SLD is in a light-load state, the currentISEN is at a low current value, so that the adjustable voltage division ratio is the first ratio; when the load current signal SLD is in a non-light-load state , the currentISEN is at a high current value so that the adjustable voltage divider ratio is the second ratio.
另外，本发明实施例提供的另一种电压调节系统，参见图6，包括：直流-直流转换器100和n个电压调节单元110；其中，n为大于1的正整数。In addition, another voltage regulation system provided by an embodiment of the present invention, referring to FIG. 6 , includes: a DC-DC converter 100 and n voltage regulation units 110 ; wherein, n is a positive integer greater than 1.
需要说明的是，直流-直流转换器100和电压调节单元110的原理以及说明参照上述实施例，故在此不在赘述。It should be noted that, the principles and descriptions of the DC-DC converter 100 and the voltage adjustment unit 110 refer to the above-mentioned embodiments, so they are not repeated here.
在上述的实施例中，如图7所示电压调节系统中调节压差和负载电流的关系图，在轻载区的调节压差Vdp1小于在非轻载区的调节压差Vdp2。In the above embodiment, as shown in FIG. 7 , the relationship between the regulation voltage difference and the load current in the voltage regulation system, the regulation voltage difference Vdp1 in the light load region is smaller than the regulation voltage difference Vdp2 in the non-light load region.
从上所述，本发明实施例提供的一种电压调节系统，可根据负载的大小适时地调整调节压差(dropout)的大小，优化电压调解系统中LDO及/或电荷泵在轻载时的效率，从而提高整个电压调解系统在轻载时的整体复合效率；还能够在轻载时调高系统中直流-直流转换器的电压反馈系数以调降直流-直流转换器的输出电压，从而降低调节压差(dropout)优化系统中之LDO及/或电荷泵在轻载时的效率，提高整个系统在轻载时的整体复合效率。From the above, a voltage regulation system provided by an embodiment of the present invention can adjust the size of the dropout in a timely manner according to the size of the load, so as to optimize the LDO and/or the charge pump in the voltage regulation system when the load is light. efficiency, thereby improving the overall composite efficiency of the entire voltage regulation system at light load; it can also increase the voltage feedback coefficient of the DC-DC converter in the system at light load to reduce the output voltage of the DC-DC converter, thereby reducing Adjusting the dropout optimizes the efficiency of the LDO and/or the charge pump in the system at light loads, improving the overall composite efficiency of the entire system at light loads.
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element. The orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must be It has a specific orientation, is constructed and operates in a specific orientation, and therefore should not be construed as a limitation of the present invention. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
本发明的说明书中，说明了大量具体细节。然而能够理解的是，本发明的实施例可以在没有这些具体细节的情况下实践。在一些实例中，并未详细示出公知的方法、结构和技术，以便不模糊对本说明书的理解。类似地，应当理解，为了精简本发明公开并帮助理解各个发明方面中的一个或多个，在上面对本发明的示例性实施例的描述中，本发明的各个特征有时被一起分组到单个实施例、图、或者对其的描述中。然而，并不应将该公开的方法解释呈反映如下意图：即所要求保护的本发明要求比在每个权利要求中所明确记载的特征更多的特征。更确切地说，如权利要求书所反映的那样，发明方面在于少于前面公开的单个实施例的所有特征。因此，遵循具体实施方式的权利要求书由此明确地并入该具体实施方式，其中每个权利要求本身都作为本发明的单独实施例。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。本发明并不局限于任何单一的方面，也不局限于任何单一的实施例，也不局限于这些方面和/或实施例的任意组合和/或置换。而且，可以单独使用本发明的每个方面和/或实施例或者与一个或更多其他方面和/或其实施例结合使用。In the description of the present invention, numerous specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it is to be understood that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment in order to simplify the present disclosure and to aid in the understanding of one or more of the various aspects of the invention. , figures, or descriptions thereof. However, this method of disclosure should not be construed to reflect the intention that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this invention. It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and/or permutation of these aspects and/or embodiments. Furthermore, each aspect and/or embodiment of the invention may be used alone or in combination with one or more other aspects and/or embodiments thereof.
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围，其均应涵盖在本发明的权利要求和说明书的范围当中。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. The scope of the invention should be included in the scope of the claims and description of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910224179.1ACN109802562A (en) | 2019-03-22 | 2019-03-22 | Voltage-regulating system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910224179.1ACN109802562A (en) | 2019-03-22 | 2019-03-22 | Voltage-regulating system |
| Publication Number | Publication Date |
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| CN109802562Atrue CN109802562A (en) | 2019-05-24 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910224179.1APendingCN109802562A (en) | 2019-03-22 | 2019-03-22 | Voltage-regulating system |
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