WO2017101313A1 - 一种电源输出电压稳定电路 - Google Patents

一种电源输出电压稳定电路 Download PDF

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WO2017101313A1
WO2017101313A1 PCT/CN2016/088462 CN2016088462W WO2017101313A1 WO 2017101313 A1 WO2017101313 A1 WO 2017101313A1 CN 2016088462 W CN2016088462 W CN 2016088462W WO 2017101313 A1 WO2017101313 A1 WO 2017101313A1
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voltage
circuit
output
voltage dividing
power
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张文
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Le Holdings Beijing Co Ltd
Leshi Zhixin Electronic Technology Tianjin Co Ltd
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Le Holdings Beijing Co Ltd
Leshi Zhixin Electronic Technology Tianjin Co Ltd
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Priority to US15/246,934 priority Critical patent/US20170168512A1/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
    • H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider

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  • Embodiments of the present invention relate to the technical field of power supply circuit design, and in particular, to a power supply output voltage stabilization circuit.
  • Any electrical appliance can not be separated from the power supply, but some electrical appliances or equipment need to input the voltage is not normal commercial power, or direct current, so it is generally necessary to convert the existing DC voltage or AC voltage into equipment through the power conversion module. The required input voltage.
  • DC-DC power supply applications are common. For example, 12V DC voltage is converted into 5V DC voltage or 3.3V DC voltage.
  • the DC-DC circuit feedback voltage generally takes the feedback voltage after the output filter capacitor, because it supplies power to external devices. It is necessary to connect a long power supply line. At this time, the output voltage will be unstable when the load of the connected device changes rapidly, but the feedback voltage taken after the output filter capacitor is generally unable to obtain the change of the load terminal voltage. If there is a large voltage overshoot at the output voltage and the output voltage is too high, the device connected to the power module may be damaged.
  • the purpose of the present application is to provide a power supply output voltage stabilization circuit for implementing a stable voltage problem.
  • an embodiment of the present invention provides a power supply output voltage stabilization circuit, including: a compensation resistor, a voltage divider circuit, and a power driver chip;
  • One end of the compensation resistor is connected to the load output end of the power source, and the other end Connected to the first end of the voltage dividing circuit, the second end of the voltage dividing circuit is connected to a voltage feedback pin of the power driving chip, and the third end of the voltage dividing circuit is grounded.
  • the voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor;
  • One end of the first voltage dividing resistor is connected to the compensation resistor as a first end of the voltage dividing circuit, and the other end is connected to a voltage feedback pin of the power driving chip as a second end of the voltage dividing circuit.
  • One end of the second voltage dividing resistor is connected to the second end, and the other end is grounded.
  • the voltage dividing circuit further includes a first filter capacitor, and the first filter capacitor is connected in parallel with the first voltage dividing resistor.
  • the circuit further includes an output filter capacitor, wherein one end of the output filter capacitor is connected to the voltage output end of the power source, and the other end is grounded.
  • the output filter capacitors are multiple.
  • the circuit further includes an inductor connected between the output filter capacitor and an output voltage pin of the power drive chip.
  • the power supply output voltage stabilization circuit provided by the embodiment of the invention provides a compensation resistor through a load output end of the power supply, and the compensation resistor feeds back the voltage of the load output end of the power supply to the voltage feedback pin of the power supply driving chip through the voltage dividing circuit, so that The power driver chip adjusts the output voltage pin of the power driver chip according to the voltage of the voltage feedback pin, so that the output voltage of the power source is kept stable, and the normal operation of the device externally connected to the output voltage is ensured.
  • FIG. 1 is a circuit diagram of a power supply output voltage stabilization circuit according to an embodiment of the present invention
  • FIG. 2 is a circuit diagram of a power supply output voltage stabilization circuit according to another embodiment of the present invention.
  • the power supply output voltage stabilization circuit includes: a first compensation resistor R1, a voltage dividing circuit, and a power driving chip U1;
  • One end of the first compensation resistor R1 is connected to the load output terminal Vcc1 of the power source, and the other end is connected to the first end a of the voltage dividing circuit, and the second end b of the voltage dividing circuit is driven by the power source
  • the voltage feedback pin FB of the chip U1 is connected, and the third end c of the voltage dividing circuit is grounded.
  • the above circuit is provided with a compensation resistor at a load output end of the power supply, and the compensation resistor feeds back the voltage of the load output end of the power supply to the voltage feedback pin of the power drive chip through the voltage dividing circuit, so that the power drive chip is based on the voltage pair of the voltage feedback pin.
  • the output voltage pin of the power driver chip is adjusted, so that the output voltage of the power supply is kept stable, and the normal operation of the device externally connected to the output voltage is ensured.
  • the voltage dividing circuit includes a first voltage dividing resistor R3 and a second voltage dividing resistor R4;
  • One end of the first voltage dividing resistor R3 is connected to the compensation resistor R1 as a first end a of the voltage dividing circuit, and the other end serves as a voltage between the second end b of the voltage dividing circuit and the power driving chip.
  • the feedback pin FB is connected, and one end of the second voltage dividing resistor R4 is connected to the second end b, and the other end is grounded.
  • the voltage dividing circuit further includes a first filter capacitor c1, and the first filter capacitor c1 is connected in parallel with the first voltage dividing resistor R3.
  • the first filter capacitor c1 is used to filter the output voltage to avoid damage to the chip due to excessive voltage spike or spike.
  • the resistance values of the first voltage dividing resistor R3 and the second voltage dividing resistor R4 can be adjusted according to the output voltage, so that the voltage of the voltage feedback pin FB of the power driving chip U1 after the voltage division is the pin.
  • the voltage is generally 0.7V.
  • different voltage values are used according to different chips, which is not limited in this embodiment.
  • the circuit in this embodiment further includes an output filter capacitor, and one end of the output filter capacitor is connected to the voltage output terminal Vcc2 of the power source, and the other end is grounded.
  • the output filter capacitors are plural, as shown in FIG. 1, c2, c3, c4, and c5.
  • the circuit further includes an inductor L1 coupled between the output filter capacitor c5 and an output voltage pin PH_2 of the power driver chip.
  • the first compensation resistor R1 can also feedback the voltage of the output terminal in time, that is, the circuit can further include a second compensation resistor R2, and one end of the second compensation resistor R2 is disposed at the rear end of the output filter capacitor, and the other end is connected to the voltage divider circuit. One end a is connected.
  • the first compensation resistor R1 and the second compensation resistor R2 can be simultaneously included in the design of the circuit in the embodiment, and R1 and the same are left in the PCB layout.
  • the selection of the resistance can be performed according to the specific debugging situation, which is not limited in this embodiment.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located One Places, or they can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Dc-Dc Converters (AREA)

Abstract

一种电源输出电压稳定电路，包括：补偿电阻（R1）、分压电路（R3、R4）和电源驱动芯片（U1）。补偿电阻的一端与电源的负载输出端（Vcc1）相连，另一端与分压电路的第一端相连，分压电路的第二端与电源驱动芯片的电压反馈引脚（FB）相连，分压电路的第三端接地。通过在电源的负载输出端设置补偿电阻，补偿电阻通过分压电路将电源的负载输出端的电压反馈到电源驱动芯片的电压反馈引脚，使得电源驱动芯片根据电压反馈引脚的电压对电源驱动芯片的输出电压引脚（PH_2）进行调整，从而使得电源的输出电压保持稳定，保证了外接输出电压的设备的正常运行。

Description

一种电源输出电压稳定电路
交叉引用
本申请引用于2015年12月14日提交的专利名称为“一种电源输出电压稳定电路”的第2015210486995号中国专利申请。上述申请在此被引做参照。
技术领域
本发明的实施例涉及电源电路设计技术领域，尤其涉一种电源输出电压稳定电路。
背景技术
任何电器都离不开电源，但是有些电器或者设备由于自身原因需要输入的电压不是正常的市电，或者是直流电，因此一般需要通过电源转换模块，将现有的直流电压或交流电压转换成设备所需的输入电压。
一般DC-DC电源应用很普遍，例如12V直流电压转换成5V直流电压或者3.3V直流电压等等，目前DC-DC电路反馈电压一般在输出滤波电容后取反馈电压，由于在给外接设备供电时，需要接很长一段电源线，这时在连接设备的负载变化较快时输出电压会存在不稳定的情况，但是在输出滤波电容后取的反馈电压一般并无法获取负载端电压的变化，这时如果输出电压存在较大的电压过冲，输出电压过高，可能会损害与电源模块相连接的设备。
发明内容
本申请的目的在于，提供一种电源输出电压稳定电路，用以实现稳定电压的输题。
为实现上述目的，本申请的实施例提供了本发明实施例提供了一种电源输出电压稳定电路，包括：补偿电阻、分压电路和电源驱动芯片；
所述补偿电阻的一端与所述电源的负载输出端相连，另一端 与所述分压电路的第一端相连，所述分压电路的第二端与所述电源驱动芯片的电压反馈引脚相连，所述分压电路的第三端接地。
可选的，所述分压电路包括第一分压电阻和第二分压电阻；
所述第一分压电阻的一端作为所述分压电路的第一端与所述补偿电阻相连，另一端作为所述分压电路的第二端与所述电源驱动芯片的电压反馈引脚相连，所述第二分压电阻的一端与所述第二端相连，另一端接地。
可选的，所述分压电路还包括第一滤波电容，所述第一滤波电容与所述第一分压电阻并连连接。
可选的，所述电路还包括输出滤波电容，所述输出滤波电容一端与所述电源的电压输出端相连，另一端接地。
可选的，所述输出滤波电容为多个。
可选的，所述电路还包括电感，所述电感连接在所述输出滤波电容和所述电源驱动芯片的输出电压引脚之间。
本发明的实施例提供的电源输出电压稳定电路，通过在电源的负载输出端设置补偿电阻，该补偿电阻通过分压电路将电源的负载输出端的电压反馈到电源驱动芯片的电压反馈引脚，使得电源驱动芯片根据电压反馈引脚的电压对电源驱动芯片的输出电压引脚进行调整，从而使得电源的输出电压保持稳定，保证了外接该输出电压的设备的正常运行。
附图说明
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一简单地介绍，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。
图1是本发明一实施例提供的电源输出电压稳定电路的电路图；
图2是本发明另一实施例提供的电源输出电压稳定电路的电路图。
具体实施方式
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、完整地描述，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作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。
图1示出了本发明实施例提供的一种电源输出电压稳定电路的电路图，如图1所示，该电源输出电压稳定电路包括：第一补偿电阻R1、分压电路和电源驱动芯片U1；
所述第一补偿电阻R1的一端与所述电源的负载输出端Vcc1相连，另一端与所述分压电路的第一端a相连，所述分压电路的第二端b与所述电源驱动芯片U1的电压反馈引脚FB相连，所述分压电路的第三端c接地。
上述电路通过在电源的负载输出端设置补偿电阻，该补偿电阻通过分压电路将电源的负载输出端的电压反馈到电源驱动芯片的电压反馈引脚，使得电源驱动芯片根据电压反馈引脚的电压对电源驱动芯片的输出电压引脚进行调整，从而使得电源的输出电压保持稳定，保证了外接该输出电压的设备的正常运行。
在本实施例的一个优选的实施方式中，所述分压电路包括第一分压电阻R3和第二分压电阻R4；
所述第一分压电阻R3的一端作为所述分压电路的第一端a与所述补偿电阻R1相连，另一端作为所述分压电路的第二端b与所述电源驱动芯片的电压反馈引脚FB相连，所述第二分压电阻R4的一端与所述第二端b相连，另一端接地。
所述分压电路还包括第一滤波电容c1，所述第一滤波电容c1与所述第一分压电阻R3并连连接。第一滤波电容c1用于将输出电压进行滤波，避免因为出现电压峰值或者尖刺，导致芯片FB电压过高损坏芯片。
可理解的是，第一分压电阻R3和第二分压电阻R4的阻值可以根据输出电压进行调整，使得分压后到电源驱动芯片U1的电压反馈引脚FB的电压为该引脚的电压，一般该电压值为0.7V，当然，根据不同的芯片会有不同的电压值，本实施例不对其进行限定。
为了将输出电压的尖峰滤掉，本实施例中的电路还包括输出滤波电容，所述输出滤波电容一端与所述电源的电压输出端Vcc2相连，另一端接地。一般所述输出滤波电容为多个，如图1所示的c2、c3、c4、c5。
所述电路还包括电感L1，所述电感L1连接在所述输出滤波电容c5和所述电源驱动芯片的输出电压引脚PH_2之间。
在另一个可实现的方式中，如图2所示，在外接设备端即负载输出端Vcc1与上述电压输出端Vcc2的引线较短，且外接设备的负载变化不明显时，不需要设置上述的第一补偿电阻R1也能够及时的反馈输出端的电压情况，即该电路还可以包括第二补偿电阻R2，第二补偿电阻R2一端设置在输出滤波电容的后端，另一端与分压电路的第一端a相连，可理解的是，为了适应不同的情况，本实施例中的在设计电路时可以同时包括第一补偿电阻R1和第二补偿电阻R2，在PCB布线时，同样留出R1和R2的位置，但是在调试电源的过程中，R1和R2只需要使用其中一个即可，本实施例可以根据具体的调试情况进行电阻的选取，本实施例不对其进行限定。
以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个 地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的实施例的技术方案，而非对其限制；尽管参照前述各实施例对本发明的实施例进行了详细的说明，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的实施例各实施例技术方案的范围。

Claims (6)

  1. 一种电源输出电压稳定电路，其特征在于，包括：补偿电阻、分压电路和电源驱动芯片；
    所述补偿电阻的一端与所述电源的负载输出端相连，另一端与所述分压电路的第一端相连，所述分压电路的第二端与所述电源驱动芯片的电压反馈引脚相连，所述分压电路的第三端接地。
  2. 根据权利要求1所述的电路，其特征在于，所述分压电路包括第一分压电阻和第二分压电阻；
    所述第一分压电阻的一端作为所述分压电路的第一端与所述补偿电阻相连，另一端作为所述分压电路的第二端与所述电源驱动芯片的电压反馈引脚相连，所述第二分压电阻的一端与所述第二端相连，另一端接地。
  3. 根据权利要求2所述的电路，其特征在于，所述分压电路还包括第一滤波电容，所述第一滤波电容与所述第一分压电阻并连连接。
  4. 根据权利要求1所述的电路，其特征在于，所述电路还包括输出滤波电容，所述输出滤波电容一端与所述电源的电压输出端相连，另一端接地。
  5. 根据权利要求4所述的电路，其特征在于，所述输出滤波电容为多个。
  6. 根据权利要求4所述的电路，其特征在于，所述电路还包括电感，所述电感连接在所述输出滤波电容和所述电源驱动芯片的输出电压引脚之间。
PCT/CN2016/088462 2015-12-14 2016-07-04 一种电源输出电压稳定电路 Ceased WO2017101313A1 (zh)

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CN201521048699.5U CN205336100U (zh) 2015-12-14 2015-12-14 一种电源输出电压稳定电路

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CN107831814A (zh) * 2017-11-14 2018-03-23 郑州云海信息技术有限公司 一种pol反馈电压回路
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