WO2020015261A1 - Dc-dc 转换电路的反馈方法及反馈电路 - Google Patents

Dc-dc 转换电路的反馈方法及反馈电路 Download PDF

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Publication number
WO2020015261A1
WO2020015261A1 PCT/CN2018/115791 CN2018115791W WO2020015261A1 WO 2020015261 A1 WO2020015261 A1 WO 2020015261A1 CN 2018115791 W CN2018115791 W CN 2018115791W WO 2020015261 A1 WO2020015261 A1 WO 2020015261A1
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voltage
feedback
conversion circuit
point
output
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PCT/CN2018/115791
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English (en)
French (fr)
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张先明
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深圳市华星光电半导体显示技术有限公司
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Publication of WO2020015261A1 publication Critical patent/WO2020015261A1/zh

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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
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques

Definitions

  • the present invention relates to the field of display technology, and in particular, to a feedback method and a feedback circuit of a DC-DC conversion circuit.
  • the existing DC-DC conversion circuit has a corresponding feedback circuit
  • the feedback point voltage is used to control the output voltage of the DC-DC conversion circuit through the feedback circuit, and the feedback point is directly pulled to the use point.
  • FIG. 1 it is a schematic diagram of an application scenario of a DC-DC conversion circuit in an existing display panel.
  • the output voltage of the power management chip 1 is converted by the DC-DC conversion circuit 2.
  • the DC-DC conversion circuit 2 sends the converted voltage to the chip 3 for use by the chip 3.
  • the DC-DC conversion circuit 2 may be a step-down circuit.
  • the chip 3 may be a chip such as a timing controller or a source driver; the wiring from the voltage output terminal of the DC-DC conversion circuit 2 to the voltage input terminal of the chip 3 is very long.
  • the feedback point of the output voltage of the DC-DC conversion circuit 2 is located near the voltage output terminal of the DC-DC conversion circuit 2 on the trace, and the use point of the output voltage of the DC-DC conversion circuit 2 is located near the chip 3 on the trace.
  • the part of the trace between the feedback point and the point of use forms an equivalent impedance 4, which causes unnecessary line loss.
  • the current method is to increase the output voltage of the DC-DC conversion circuit, but this method is easy to encounter when the DC- There is no current output when the DC conversion circuit outputs a voltage.
  • the voltage to the chip (IC) end that is, the point of use of the output voltage, may exceed its demand limit, causing damage to the chip.
  • an object of the present invention is to provide a feedback method and a feedback circuit of a DC-DC conversion circuit, so as to make up for a voltage drop caused by unnecessary line loss when the DC-DC conversion circuit outputs a voltage in a display panel.
  • the present invention provides a feedback method of a DC-DC conversion circuit, including:
  • Step 10 Obtain the impedance from the feedback point of the output voltage of the DC-DC conversion circuit to the point of use in advance; the voltage output terminal of the DC-DC conversion circuit outputs a voltage to the voltage input terminal of the chip via a trace, and the feedback point is on the trace It is located near the voltage output terminal of the DC-DC conversion circuit, and the use point is located near the voltage input terminal of the chip on the trace;
  • Step 20 Detect an output current output from the DC-DC conversion circuit to the chip
  • Step 30 Calculate a voltage offset between the feedback point and the use point according to the output current and impedance.
  • Step 40 Subtract the voltage offset from the feedback point voltage to obtain a final feedback voltage.
  • the feedback method of the DC-DC conversion circuit further includes: Step 50: Adjust the output voltage of the DC-DC conversion circuit according to the final feedback voltage.
  • the output voltage of the DC-DC conversion circuit is reduced; if the final feedback voltage is less than the preset value, the output voltage of the DC-DC conversion circuit is increased.
  • the impedance is obtained through calculation of the layout design of the trace; or, the impedance is obtained through actual measurement by a multimeter.
  • the present invention also provides a feedback circuit of a DC-DC conversion circuit, including:
  • the impedance module provides the impedance from the feedback point of the output voltage of the DC-DC conversion circuit to the point of use in advance; the voltage output terminal of the DC-DC conversion circuit outputs a voltage to the voltage input terminal of the chip via a wire, and the feedback point is The line is located near the voltage output terminal of the DC-DC conversion circuit, and the use point is located near the voltage input terminal of the chip on the trace;
  • An output current detection module for detecting an output current output from the DC-DC conversion circuit to the chip
  • An offset calculation module configured to calculate a voltage offset between the feedback point and the use point according to the output current and impedance
  • a final feedback voltage calculation module for subtracting the voltage offset from a feedback point voltage to obtain a final feedback voltage
  • a feedback control module is configured to perform feedback control on the DC-DC conversion circuit according to the final feedback voltage.
  • the impedance is obtained through actual measurement by a multimeter.
  • the impedance is calculated through the layout design of the trace.
  • the offset calculation module is a multiplier. A first input terminal inputs and outputs current, a second input terminal connects to the impedance, and an output terminal outputs a voltage offset at a feedback point.
  • the final feedback voltage calculation module is a subtractor, the voltage offset of the feedback point is input at the inverting input terminal, the feedback point voltage is input at the non-inverting input terminal, and the final feedback voltage is output at the output terminal.
  • the present invention also provides a feedback circuit of a DC-DC conversion circuit, including:
  • the impedance module provides the impedance from the feedback point of the output voltage of the DC-DC conversion circuit to the point of use in advance; the voltage output terminal of the DC-DC conversion circuit outputs a voltage to the voltage input terminal of the chip via a wire, and the feedback point is The line is located near the voltage output terminal of the DC-DC conversion circuit, and the use point is located near the voltage input terminal of the chip on the trace;
  • An output current detection module for detecting an output current output from the DC-DC conversion circuit to the chip
  • An offset calculation module for calculating a voltage offset between the feedback point and the use point according to the output current and impedance
  • a final feedback voltage calculation module is configured to subtract the voltage offset from a feedback point voltage to obtain a final feedback voltage.
  • the impedance is obtained through actual measurement by a multimeter.
  • the impedance is calculated through the layout design of the trace.
  • the offset calculation module is a multiplier. A first input terminal inputs and outputs current, a second input terminal connects to the impedance, and an output terminal outputs a voltage offset at a feedback point.
  • the final feedback voltage calculation module is a subtractor, the voltage offset of the feedback point is input at the inverting input terminal, the feedback point voltage is input at the non-inverting input terminal, and the final feedback voltage is output at the output terminal.
  • the feedback method and feedback circuit of the DC-DC conversion circuit of the present invention can make up for the voltage drop caused by unnecessary line loss when the DC-DC conversion circuit outputs the voltage in the display panel, and ensure the normal operation of various drive circuits of the display panel.
  • FIG. 1 is a schematic diagram of an application scenario of a DC-DC conversion circuit in an existing display panel
  • FIG. 3 is a circuit block diagram of a feedback circuit of the DC-DC conversion circuit of the present invention.
  • FIG. 4 is a circuit diagram of a feedback circuit of a DC-DC conversion circuit according to a preferred embodiment of the present invention.
  • FIG. 2 it is a flowchart of a feedback method of a DC-DC conversion circuit according to the present invention.
  • the feedback method of the DC-DC conversion circuit of the present invention measures the output current during the output voltage of the DC-DC conversion circuit, and calculates the impedance from the feedback point to the point of use of the output voltage of the DC-DC conversion circuit obtained in advance according to the magnitude of the output current and the calculated impedance The voltage offset of the feedback point, and then the final feedback voltage is obtained.
  • the final feedback voltage can be used to confirm the final output voltage of the DC-DC conversion circuit. mainly include:
  • Step 10 Obtain the impedance from the feedback point of the output voltage of the DC-DC conversion circuit to the point of use in advance; the voltage output terminal of the DC-DC conversion circuit outputs a voltage to the voltage input terminal of the chip via a trace, and the feedback point is on the trace It is located near the voltage output end of the DC-DC conversion circuit, and the use point is located near the voltage input end of the chip on the trace; when designing the feedback circuit of the DC-DC conversion circuit, the circuit is reserved for each The output impedance corresponding to the output voltage is selected for subsequent calculation of the voltage offset of the feedback point; the output impedance is the impedance between the feedback point of the output voltage and the point of use. Usually this part of the impedance can be measured by a multimeter, or Calculated during the layout design of the wiring;
  • Step 20 Detect an output current output from the DC-DC conversion circuit to the chip; use a common design of an existing feedback circuit to detect the output current of the DC-DC conversion circuit;
  • Step 30 Calculate the voltage offset between the feedback point and the use point according to the output current and impedance; input the output current and impedance into the chip or corresponding circuit module, multiply the output current and impedance, and use the chip or The corresponding circuit module calculates the loss of the output voltage between the feedback point and the use point, that is, the magnitude of the voltage offset at the feedback point;
  • Step 40 Subtract the voltage offset from the feedback point voltage to obtain a final feedback voltage; use the calculated voltage offset to reversely adjust the feedback point voltage to obtain a final feedback voltage;
  • Step 50 Adjust the output voltage of the DC-DC conversion circuit according to the final feedback voltage; add the obtained final feedback voltage to the feedback circuit of the entire DC-DC conversion circuit, as the final feedback voltage is greater than The preset value reduces the output voltage of the DC-DC conversion circuit. If the final feedback voltage is less than the preset value, the output voltage of the DC-DC conversion circuit is increased; a suitable output voltage is obtained by controlling the DC-DC conversion circuit. Furthermore, the chip terminal, that is, the point of use of the output voltage, can obtain an accurate voltage.
  • FIG. 3 is a circuit block diagram of a feedback circuit of the DC-DC conversion circuit of the present invention
  • FIG. 4 is a schematic circuit diagram of a preferred embodiment of the present invention.
  • the feedback circuit of the DC-DC conversion circuit of the present invention calculates the voltage offset Vloss of the feedback point voltage VFB for the magnitude of the output current Current, and reversely adjusts the feedback point voltage VFB to obtain the final value.
  • the feedback voltage VFB_final is based on the final feedback voltage VFB_final to obtain the output voltage required at this time; it mainly includes: the impedance module 100, which provides the impedance from the feedback point of the output voltage of the DC-DC conversion circuit to the point of use; the DC-DC conversion circuit The voltage output terminal outputs a voltage to the voltage input terminal of the chip via a trace.
  • the feedback point is located near the voltage output terminal of the DC-DC conversion circuit on the trace.
  • the use point is at the voltage near the chip on the trace.
  • output current detection module 200 for detecting the output current of the DC-DC conversion circuit
  • offset calculation module 300 for the feedback point to the use point according to the output current and the output voltage of the DC-DC conversion circuit Impedance of the feedback point to calculate the voltage offset of the feedback point
  • the final feedback voltage calculation module 400 is configured to subtract the voltage offset of the feedback point from the voltage of the feedback point, To the final feedback voltage
  • a feedback control module 500 for performing feedback control on the DC-DC conversion circuit according to the final feedback voltage; if the final feedback voltage is greater than a preset value, reducing the output voltage of the DC-DC conversion circuit; If the final feedback voltage is less than a preset value, the output voltage of the DC-DC conversion circuit is increased.
  • the impedance module 100 can be a preset fixed resistance, so that it can directly provide a corresponding resistance; or it can also use other quantities to indirectly indicate the resistance. For example, when the current flowing through the resistance is constant, the voltage on the resistance is proportional to the resistance. Directly proportional. As shown in FIG. 4, in the preferred embodiment, a fixed preset resistance Rset is used to indicate the impedance from the feedback point to the point of use of the output voltage of the DC-DC conversion circuit in advance; as mentioned above, usually the preset resistance Rset can be passed through a multimeter Actual measurement, or calculated through layout design.
  • the offset calculation module 300 can calculate the voltage offset Vloss of the feedback point voltage VFB for the magnitude of the output current Current and the impedance obtained in advance, and the voltage offset Vloss is the loss of the output voltage on the wiring.
  • the offset calculation module 300 may be a chip or a circuit module that implements the corresponding function. As shown in FIG. 4, it may be a multiplier OP1.
  • the first input terminal inputs and outputs the current Current, and the second input terminal is connected to a preset resistor. Rset, the voltage offset Vloss of the output point output feedback point voltage.
  • the voltage offset Vloss is obtained by multiplying the output current Current by a preset resistance Rset.
  • the final feedback voltage calculation module 400 calculates the final feedback voltage VFB_final by subtracting the voltage offset Vloss from the feedback point voltage VFB;
  • the final feedback voltage calculation module 400 may be a chip or a circuit module that implements the corresponding function, as shown in Figure 3. Specifically shown may be a subtractor OP2, whose inverting input terminal is connected to the output terminal of the multiplier OP1, the voltage offset Vloss of the feedback point is input, the feedback point voltage VFB is input to the non-inverting input terminal, and the output terminal outputs the final feedback voltage VFB_final.
  • Others include the detection of the output current by the output current detection module 200, and the feedback control module 500 performing feedback control on the DC-DC conversion circuit according to the final feedback voltage VFB_final to obtain the output voltage required at this time.
  • the feedback circuit of the present invention obtains the final feedback voltage VFB_final reflecting the situation at the output voltage using the offset calculation module 300 and the final feedback voltage calculation module 400, instead of the feedback point voltage VFB on the DC-DC.
  • the output voltage of the conversion circuit is controlled, which is consistent with the effect of directly pulling the feedback point to the use point, and at the same time avoids the problem of too long feedback traces.
  • the DC-DC conversion circuit can make the voltage obtained at the chip end, that is, the point of use of the output voltage, most suitable under different use conditions and different output currents. .
  • the invention can adjust the output voltage of the DC-DC conversion circuit according to different output currents.
  • the present invention does not affect the output voltage with a very small impedance from the feedback point to the use point. For an output voltage with a very small impedance, the impedance can be set to 0. At this time, the feedback point voltage VFB is the final feedback voltage VFB_final.
  • the technical solution of the present invention can be applied to all high-current driving to make up for the voltage drop caused by unnecessary line loss and ensure the normal operation of various driving circuits of the display panel.
  • the feedback method and feedback circuit of the DC-DC conversion circuit of the present invention can make up for the voltage drop caused by unnecessary line loss when the DC-DC conversion circuit outputs the voltage in the display panel, and ensure the normal operation of various drive circuits of the display panel.

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

Abstract

一种DC‑DC转换电路的反馈方法及反馈电路。该DC‑DC转换电路的反馈方法包括：步骤10、预先得到DC‑DC转换电路输出电压的反馈点到使用点的阻抗；DC‑DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，反馈点在走线上处于临近DC‑DC转换电路的电压输出端的位置，使用点在走线上处于临近芯片的电压输入端的位置；步骤20、侦测DC‑DC转换电路向芯片输出的输出电流；步骤30、根据输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；步骤40、将反馈点电压减去所述电压偏移量，得到最终反馈电压。弥补了显示面板中DC‑DC转换电路输出电压时无用线损导致的压降，保证显示面板各种驱动电路的正常工作。

Description

DC-DC转换电路的反馈方法及反馈电路 技术领域
本发明涉及显示技术领域，尤其涉及一种DC-DC转换电路的反馈方法及反馈电路。
 背景技术
对于目前的显示面板设计发展趋势来说，会遇到显示面板尺寸越来越大的问题，同时为了降低成本，会采用X+C（X板+控制板）的架构，在这种情况下，显示面板中各种DC-DC（直流-直流）转换电路输出电压时的输出电流的发展趋势是逐渐增大，但是能够用于布置走线的宽度会越来越小，且走线会越来越长，那么在走线上的压降也会越来越大，无用线损导致的压降造成DC-DC转换电路输出电压的使用点所获得的面板驱动所需要的电压会降低，甚至于低于所需要电压范围下限。现有DC-DC转换电路虽然具有相应的反馈电路，通过反馈电路引入反馈点电压对DC-DC转换电路的输出电压进行控制，将反馈点直接拉至使用点，这种方法虽然可以降低电压压降，但是由于反馈走线过长，一样会造成输出电压不稳的问题。
参见图1，其为现有显示面板中DC-DC转换电路应用场景示意图。电源管理芯片1所输出电压经DC-DC转换电路2进行变换，DC-DC转换电路2再将变换后的电压输送至芯片3由芯片3进行使用；DC-DC转换电路2可以是降压电路或者其他类型的电路，芯片3可以为时序控制器或者源极驱动器等芯片；DC-DC转换电路2的电压输出端到芯片3的电压输入端之间的走线很长，按照现有技术，DC-DC转换电路2输出电压的反馈点在走线上处于临近DC-DC转换电路2的电压输出端的位置，而DC-DC转换电路2输出电压的使用点在走线上处于临近芯片3的电压输入端的位置，走线在反馈点与使用点之间的部分形成了等效阻抗4，造成无用线损。为解决上述无用线损导致的压降，造成输出电压不稳的问题，目前采用的方法是将DC-DC转换电路输出电压调高，但是这种方法很容易遇到在开机时，各DC-DC转换电路输出电压时无电流输出，到芯片（IC）端即输出电压使用点的电压可能会超出其需求限制，造成芯片的损伤。
 技术问题
因此，本发明的目的在于提供一种DC-DC转换电路的反馈方法及反馈电路，弥补显示面板中DC-DC转换电路输出电压时无用线损导致的压降。
 技术解决方案
为实现上述目的，本发明提供了一种DC-DC转换电路的反馈方法，包括：
步骤10、预先得到DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；
步骤20、侦测DC-DC转换电路向芯片输出的输出电流；
步骤30、根据输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；以及
步骤40、将反馈点电压减去所述电压偏移量，得到最终反馈电压。
其中，所述DC-DC转换电路的反馈方法还包括：步骤50、根据最终反馈电压，调整DC-DC转换电路的输出电压。
其中，如所述最终反馈电压大于预设值，则降低DC-DC转换电路的输出电压；如所述最终反馈电压小于预设值，则提高DC-DC转换电路的输出电压。
其中，所述阻抗通过走线布局设计计算得到；或者，所述阻抗通过万用表实际量测得到。
本发明还提供了一种DC-DC转换电路的反馈电路，包括：
阻抗模块，提供预先得到的DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；
输出电流侦测模块，用于侦测DC-DC转换电路向芯片输出的输出电流；
偏移量计算模块，用于根据所述输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；
最终反馈电压计算模块，用于将反馈点电压减去所述电压偏移量，得到最终反馈电压；以及
反馈控制模块，用于根据最终反馈电压对DC-DC转换电路进行反馈控制。
其中，所述阻抗通过万用表实际量测得到。
其中，所述阻抗通过走线布局设计计算得到。
其中，所述偏移量计算模块为乘法器，其第一输入端输入输出电流，其第二输入端连接所述阻抗，其输出端输出反馈点的电压偏移量。
其中，所述最终反馈电压计算模块为减法器，其反相输入端输入反馈点的电压偏移量，同相输入端输入反馈点电压，输出端输出最终反馈电压。
本发明还提供了一种DC-DC转换电路的反馈电路，包括：
阻抗模块，提供预先得到的DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；
输出电流侦测模块，用于侦测DC-DC转换电路向芯片输出的输出电流；
偏移量计算模块，用于根据所述输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；以及
最终反馈电压计算模块，用于将反馈点电压减去所述电压偏移量，得到最终反馈电压。
其中，所述阻抗通过万用表实际量测得到。
其中，所述阻抗通过走线布局设计计算得到。
其中，所述偏移量计算模块为乘法器，其第一输入端输入输出电流，其第二输入端连接所述阻抗，其输出端输出反馈点的电压偏移量。
其中，所述最终反馈电压计算模块为减法器，其反相输入端输入反馈点的电压偏移量，同相输入端输入反馈点电压，输出端输出最终反馈电压。
 有益效果
综上，本发明DC-DC转换电路的反馈方法及反馈电路，能够弥补显示面板中DC-DC转换电路输出电压时无用线损导致的压降，保证显示面板各种驱动电路的正常工作。
 附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为现有显示面板中DC-DC转换电路应用场景示意图；
图2为本发明DC-DC转换电路的反馈方法的流程图；
图3为本发明DC-DC转换电路的反馈电路的电路方框图；
图4为本发明DC-DC转换电路的反馈电路一较佳实施例的电路示意图。
 本发明的实施方式
参见图2，其为本发明DC-DC转换电路的反馈方法的流程图。本发明DC-DC转换电路的反馈方法在DC-DC转换电路输出电压过程中量测输出电流，根据输出电流的大小以及预先得到的DC-DC转换电路输出电压反馈点到使用点的阻抗，计算反馈点的电压偏移量，进而得到最终反馈电压，最终反馈电压可以用来确认DC-DC转换电路的最终输出电压。主要包括：
步骤10、预先得到DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；在对DC-DC转换电路的反馈电路进行设计时，电路中预留对各输出电压对应的输出阻抗的选择，以用于后续计算反馈点的电压偏移量；输出阻抗即输出电压的反馈点到使用点之间的阻抗，通常这一部分阻抗可以通过万用表实际量测，或者在走线布局（Layout）设计时通过计算得到；
步骤20、侦测DC-DC转换电路向芯片输出的输出电流；利用现有反馈电路的常见设计对DC-DC转换电路输出电流进行侦测；
步骤30、根据输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；将输出电流与阻抗输入芯片或相应电路模块，将输出电流与阻抗相乘，利用芯片或相应电路模块算出输出电压在反馈点与使用点之间走线上的损耗，也就是反馈点的电压偏移量的大小；
步骤40、将反馈点电压减去所述电压偏移量，得到最终反馈电压；利用算出的电压偏移量对反馈点电压做反向调整，得到最终反馈电压；
进一步可以包括：步骤50、根据最终反馈电压，调整DC-DC转换电路的输出电压；将所得到的最终反馈电压加入到整个DC-DC转换电路的反馈电路中去，如所述最终反馈电压大于预设值，则降低DC-DC转换电路的输出电压，如所述最终反馈电压小于预设值，则提高DC-DC转换电路的输出电压；通过控制DC-DC转换电路得到适合的输出电压，进而可以使芯片端即输出电压使用点得到准确的电压。
参见图3及图4，图3为本发明DC-DC转换电路的反馈电路的电路方框图，图4为本发明一较佳实施例的电路示意图。结合图3和图4可知，本发明的DC-DC转换电路的反馈电路针对输出电流Current的大小，算出反馈点电压VFB的电压偏移量Vloss，对反馈点电压VFB做反向调整，得到最终反馈电压VFB_final，根据最终反馈电压VFB_final得到此时所需的输出电压；主要包括：阻抗模块100，提供预先得到的DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；输出电流侦测模块200，用于侦测DC-DC转换电路的输出电流；偏移量计算模块300，用于根据输出电流与DC-DC转换电路输出电压的反馈点到使用点的阻抗，算出反馈点的电压偏移量；最终反馈电压计算模块400，用于将反馈点电压减去反馈点的电压偏移量，得到最终反馈电压；以及反馈控制模块500，用于根据最终反馈电压对DC-DC转换电路进行反馈控制；如所述最终反馈电压大于预设值，则降低DC-DC转换电路的输出电压；如所述最终反馈电压小于预设值，则提高DC-DC转换电路的输出电压。
阻抗模块100具体可以为预设的固定电阻，从而可以直接提供相应大小的阻抗；或者也可以利用其他量间接表示电阻的大小，例如流经电阻的电流一定时，电阻上的电压与电阻大小成正比。如图4所示，该较佳实施例中以固定的预设电阻Rset来表示预先得到DC-DC转换电路输出电压的反馈点到使用点的阻抗；如前述，通常预设电阻Rset可以通过万用表实际量测，或者在走线布局（Layout）设计时通过计算得到。
偏移量计算模块300针对输出电流Current的大小以及预先得到的阻抗的大小，能够算出反馈点电压VFB的电压偏移量Vloss的大小，电压偏移量Vloss即为输出电压在走线上的损耗；偏移量计算模块300可以为实现相应功能的芯片或电路模块等结构，如图4所示具体可以为乘法器OP1，其第一输入端输入输出电流Current，第二输入端连接预设电阻Rset，输出端输出反馈点电压的电压偏移量Vloss，通过将输出电流Current与预设电阻Rset相乘得到电压偏移量Vloss。
最终反馈电压计算模块400将电压偏移量Vloss与反馈点电压VFB进行减法计算，得到的最终反馈电压VFB_final；最终反馈电压计算模块400可以为实现相应功能的芯片或电路模块等结构，如图3所示具体可以为减法器OP2，其反相输入端连接乘法器OP1的输出端，输入反馈点的电压偏移量Vloss，同相输入端输入反馈点电压VFB，输出端输出最终反馈电压VFB_final。
其他例如输出电流侦测模块200对输出电流Current的侦测，以及反馈控制模块500根据最终反馈电压VFB_final对DC-DC转换电路进行反馈控制以得到此时所需的输出电压，为现在反馈电路的常见设置，不再描述。本发明的反馈电路相较于现有反馈电路，通过偏移量计算模块300和最终反馈电压计算模块400得到反映输出电压使用点处情况的最终反馈电压VFB_final，代替反馈点电压VFB对DC-DC转换电路的输出电压进行控制，与将反馈点直接拉至使用点的效果一致，同时避免了反馈走线过长的问题。
通过本发明DC-DC转换电路的反馈方法及反馈电路，可以使得DC-DC转换电路在不同使用情况下，以及不同输出电流下，使芯片端即输出电压使用点得到的电压都是最合适的。本发明可以根据不同的输出电流大小，调整DC-DC转换电路输出电压大小。且本发明不会影响反馈点到使用点的阻抗很小时的输出电压，对于阻抗很小时的输出电压，可以将阻抗设置为0，此时反馈点电压VFB即为最终反馈电压VFB_final。
本发明的技术方案可以适用于所有大电流驱动，用以弥补无用线损导致的压降，保证显示面板各种驱动电路的正常工作。
综上，本发明DC-DC转换电路的反馈方法及反馈电路，能够弥补显示面板中DC-DC转换电路输出电压时无用线损导致的压降，保证显示面板各种驱动电路的正常工作。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (14)

  1. 一种DC-DC转换电路的反馈方法，包括：
    步骤10、预先得到DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；
    步骤20、侦测DC-DC转换电路向芯片输出的输出电流；
    步骤30、根据输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；以及
    步骤40、将反馈点电压减去所述电压偏移量，得到最终反馈电压。
  2. 如权利要求1所述的DC-DC转换电路的反馈方法，还包括：步骤50、根据最终反馈电压，调整DC-DC转换电路的输出电压。
  3. 如权利要求1所述的DC-DC转换电路的反馈方法，如所述最终反馈电压大于预设值，则降低DC-DC转换电路的输出电压；如所述最终反馈电压小于预设值，则提高DC-DC转换电路的输出电压。
  4. 如权利要求1所述的DC-DC转换电路的反馈方法，其中所述阻抗通过走线布局设计计算得到；或者，所述阻抗通过万用表实际量测得到。
  5. 一种DC-DC转换电路的反馈电路，包括：
    阻抗模块，提供预先得到的DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；
    输出电流侦测模块，用于侦测DC-DC转换电路向芯片输出的输出电流；
    偏移量计算模块，用于根据所述输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；
    最终反馈电压计算模块，用于将反馈点电压减去所述电压偏移量，得到最终反馈电压；以及
    反馈控制模块，用于根据最终反馈电压对DC-DC转换电路进行反馈控制。
  6. 如权利要求5所述的DC-DC转换电路的反馈电路，其中所述阻抗通过万用表实际量测得到。
  7. 如权利要求5所述的DC-DC转换电路的反馈电路，其中所述阻抗通过走线布局设计计算得到。
  8. 如权利要求5所述的DC-DC转换电路的反馈电路，其中所述偏移量计算模块为乘法器，其第一输入端输入输出电流，其第二输入端连接所述阻抗，其输出端输出反馈点的电压偏移量。
  9. 如权利要求5所述的DC-DC转换电路的反馈电路，其中所述最终反馈电压计算模块为减法器，其反相输入端输入反馈点的电压偏移量，同相输入端输入反馈点电压，输出端输出最终反馈电压。
  10. 一种DC-DC转换电路的反馈电路，包括：
    阻抗模块，提供预先得到的DC-DC转换电路输出电压的反馈点到使用点的阻抗；DC-DC转换电路的电压输出端经由走线向芯片的电压输入端输出电压，所述反馈点在走线上处于临近DC-DC转换电路的电压输出端的位置，所述使用点在走线上处于临近芯片的电压输入端的位置；
    输出电流侦测模块，用于侦测DC-DC转换电路向芯片输出的输出电流；
    偏移量计算模块，用于根据所述输出电流与阻抗，算出所述反馈点与所述使用点之间的电压偏移量；以及
    最终反馈电压计算模块，用于将反馈点电压减去所述电压偏移量，得到最终反馈电压。
  11. 如权利要求10所述的DC-DC转换电路的反馈电路，其中所述阻抗通过万用表实际量测得到。
  12. 如权利要求10所述的DC-DC转换电路的反馈电路，其中所述阻抗通过走线布局设计计算得到。
  13. 如权利要求10所述的DC-DC转换电路的反馈电路，其中所述偏移量计算模块为乘法器，其第一输入端输入输出电流，其第二输入端连接所述阻抗，其输出端输出反馈点的电压偏移量。
  14. 如权利要求10所述的DC-DC转换电路的反馈电路，其中所述最终反馈电压计算模块为减法器，其反相输入端输入反馈点的电压偏移量，同相输入端输入反馈点电压，输出端输出最终反馈电压。
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