WO2017107267A1 - 一种反馈控制电路及电源管理模块 - Google Patents

一种反馈控制电路及电源管理模块 Download PDF

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Publication number
WO2017107267A1
WO2017107267A1 PCT/CN2016/070915 CN2016070915W WO2017107267A1 WO 2017107267 A1 WO2017107267 A1 WO 2017107267A1 CN 2016070915 W CN2016070915 W CN 2016070915W WO 2017107267 A1 WO2017107267 A1 WO 2017107267A1
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Prior art keywords
power management
circuit
control circuit
output signal
output
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English (en)
French (fr)
Inventor
曹丹
张先明
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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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Priority to US14/917,006 priority Critical patent/US10141840B2/en
Publication of WO2017107267A1 publication Critical patent/WO2017107267A1/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
    • 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
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/625—Regulating voltage or current  wherein it is irrelevant whether the variable actually regulated is AC or DC

Definitions

  • the present invention relates to the field of integrated circuits, and in particular, to a feedback control circuit and a power management module.
  • PMICs Power Management ICs
  • the PMIC is usually provided with a feedback circuit that can detect the change of the output voltage/output current of the PMIC and output voltage/output current to the PMIC according to the change. Compensation is performed to maintain the output voltage/output current stable.
  • the feedback circuit detects the output signal of the PMIC to compensate it, and requires a certain response time.
  • the existing feedback circuit can compensate the output signal of the PMIC according to the load change, the response time is fixed regardless of the load change, and does not change with the load change.
  • the longer response time under heavy load conditions will result in larger output ripple, which may cause electromagnetic compatibility problems.
  • the embodiment of the invention provides a feedback control circuit and a power management module, which can shorten the feedback response time of the power management chip, reduce the ripple of the output signal of the power management chip, and improve the output stability of the power management chip.
  • a first aspect of the embodiments of the present invention provides a feedback control circuit, where the feedback control circuit includes a sampling analysis circuit, a comparison circuit, and a switch tube control circuit, where:
  • the sampling analysis circuit is connected to the power management chip for sampling an output signal of the power management chip, and analyzing a change trend of the output signal to obtain a first output signal;
  • the comparison circuit is connected to the sampling analysis circuit and the switch tube control circuit for comparing the first output signal with a reference signal to obtain a second output signal;
  • the switch tube control circuit includes a pulse width modulation PWM control circuit and a switch tube, wherein the PWM control circuit is connected to the comparison circuit and the switch tube, the switch tube is connected to the power management chip, and the switch tube is controlled
  • the circuit is configured to adjust a duty cycle of the switch tube according to the second output signal to adjust a compensation time of an output signal of the power management chip.
  • the sampling analysis circuit is a differentiation circuit for performing a differential operation on the output signal to obtain a slope of the output signal, and a slope of the output circuit is the first output signal.
  • the differentiating circuit includes a first operational amplifier, a first capacitor, a first resistor, and a second resistor, wherein:
  • the inverting input end of the first operational amplifier is connected to the output pin of the power management chip through the first capacitor and the first resistor connected in series, and the non-inverting input end of the first operational amplifier is grounded.
  • An output of the first operational amplifier is coupled to the comparison circuit and coupled to the inverting input of the first operational amplifier through the second resistor.
  • the non-inverting input of the comparison circuit is coupled to an output of the sampling and analysis circuit, an inverting input of the comparison circuit is coupled to the reference signal, and an output of the comparison circuit is coupled.
  • the PWM control circuit is configured to control the non-inverting input of the comparison circuit.
  • the comparison circuit is used to:
  • an input end of the PWM control circuit is connected to an output end of the comparison circuit; an output end of the PWM control circuit is connected to a first end of the switch tube;
  • the second end of the switch tube is connected to an output pin of the power management chip, and the third end of the switch tube is grounded.
  • the switch transistor is a metal oxide semiconductor MOS transistor.
  • a second aspect of the embodiments of the present invention provides a power management module, where the power management module includes a power management chip and the feedback control circuit according to the first aspect or any feasible implementation manner of the first aspect.
  • the power management module further includes the foregoing power management chip. Peripheral control circuit.
  • the feedback control circuit includes a sampling analysis circuit, a comparison circuit, and a switch tube control circuit.
  • the sampling analysis circuit can sample the output signal of the power management chip and analyze the change trend of the output signal to obtain a first output signal, and the comparison circuit. Comparing the first output signal with the reference signal to obtain a second output signal, and the PWM control circuit in the switch tube control circuit generates a PWM signal according to the second output signal, and adjusts a duty ratio of the switch tube connected to the power management chip to Adjust the compensation time for the output signal of the power management chip. Due to the simple circuit structure, the change of the output signal of the power management chip can be reflected to the switching tube control circuit in time, thereby shortening the response time of the feedback and reducing the ripple of the output signal.
  • FIG. 1 is a schematic structural diagram of a feedback control circuit according to an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a feedback control circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a power management module according to an embodiment of the present invention.
  • FIG. 4 is a circuit diagram of a power management module provided by an embodiment of the present invention.
  • the embodiment of the invention provides a feedback control circuit and a power management module, which can shorten the feedback response time of the power management chip, reduce the ripple of the output signal of the power management chip, and improve the output stability of the power management chip.
  • FIG. 1 is a schematic structural diagram of a feedback control circuit according to an embodiment of the present invention.
  • the feedback control circuit 10 is applied to a power management chip.
  • the path may include a sample analysis circuit 101, a comparison circuit 102, and a switch control circuit 103, wherein:
  • the sampling analysis circuit 101 is connected to the power management chip for sampling the output signal of the power management chip, and analyzing the change trend of the output signal to obtain a first output signal.
  • the output signal of the power management chip may be a voltage signal or a current signal.
  • the sampling and analyzing circuit 101 may be a differential circuit.
  • the output signal of the differential circuit is proportional to the rate of change of the input signal.
  • the differential is obtained.
  • the circuit can obtain the slope of the output signal change of the power management chip, and the slope is the first output signal.
  • the comparison circuit 102 is connected to the sampling analysis circuit 101 and the switch control circuit 103 for comparing the first output signal with the reference signal to obtain a second output signal.
  • the second output signal may be a high level or a low level.
  • the comparison circuit 102 can compare the first output signal with the reference signal and output a high/low level according to the comparison result. For example, if the first output signal is greater than the reference signal, the comparison circuit 102 outputs a high level, otherwise the comparison circuit 102 outputs a low level.
  • the reference signal of the comparison circuit 102 can be provided by other circuits or devices.
  • the switch tube control circuit 103 includes a Pulse Width Modulation (PWM) control circuit and a switch tube, wherein the PWM control circuit is connected to the comparison circuit 102 and the switch tube, and the switch tube is connected to the power management chip.
  • the switch tube control circuit 103 is configured to adjust a duty ratio of the switch tube according to the second output signal to adjust a compensation time of an output signal of the power management chip.
  • the input end of the PWM control circuit is connected to the output end of the comparison circuit 102, and the output end of the PWM control circuit is connected to the switch tube.
  • the PWM control circuit generates a PWM signal that can control the duty ratio of the switch tube according to the second output signal outputted by the comparison circuit 102, and outputs the PWM signal to the control end of the switch tube.
  • the larger the duty cycle the longer the switch is turned on in one cycle.
  • the switch tube may be a field effect transistor or a triode.
  • the switch tube may be a MOS tube.
  • the feedback control circuit includes a sampling analysis circuit, a comparison circuit, and a switch tube control circuit.
  • the sampling analysis circuit can sample the output signal of the power management chip and analyze the change trend of the output signal to obtain a first output signal, and the comparison circuit. Comparing the first output signal with a reference signal, Obtaining a second output signal, the PWM control circuit in the switch tube control circuit generates a PWM signal according to the second output signal, and adjusts a duty ratio of the switch tube connected to the power management chip to adjust a compensation time of the output signal of the power management chip . Due to the simple circuit structure, the change of the output signal of the power management chip can be reflected to the switching tube control circuit in time, thereby shortening the response time of the feedback, reducing the ripple of the output signal, and improving the output stability of the power management chip.
  • the feedback control circuit 20 is applicable to the power management chip U1.
  • the feedback control circuit may include a sampling analysis circuit 201, a comparison circuit 202, and a switching tube control circuit 203, wherein the switching tube control circuit 203 includes a PWM control circuit 2031 and a switching transistor Q1.
  • the sampling analysis circuit 201 includes a first operational amplifier A1, a first capacitor C1, a first resistor R1, and a second resistor R2.
  • the inverting input terminal of the first operational amplifier A1 sequentially passes through the first capacitor C1 and the first A resistor R1 is connected to an output pin of the power management chip U1, a non-inverting input terminal of the first operational amplifier A1 is grounded, and an output end of the first operational amplifier A1 is connected to the comparison circuit 202 and passes through the second A resistor R2 is coupled to the inverting input of the first operational amplifier A1.
  • the first operational amplifier A1, the first capacitor C1 and the first resistor R1 in the sampling and analyzing circuit 201 constitute a differential circuit
  • the output signal of the differential circuit is proportional to the rate of change of the input signal, when the input signal of the differential circuit ( That is, when the output signal of the power management chip changes, the slope of the output signal change of the power management chip can be obtained by the differentiation circuit, and the slope is the first output signal.
  • the output signal of the power management chip may be a voltage signal or a current signal.
  • the comparison circuit 202 is implemented by the comparator A2.
  • the non-inverting input terminal of the comparator A2 is connected to the output end of the first operational amplifier A1 (ie, the output end of the sampling analysis circuit 201), and the inverting input terminal of the comparator A2 is connected to the reference signal Vref.
  • the output of comparator A2 is coupled to the input of PWM control circuit 2031.
  • the output end of the PWM control circuit 2031 is connected to the control terminal (ie, the first end) of the switching transistor Q1.
  • the second end and the third end of the switch tube Q1 are respectively connected to the power management chip and the ground.
  • the second output signal can be a high level or a low level.
  • the comparator A2 compares the first output signal output by the sampling analysis circuit 201 with the reference signal Vref accessed from the inverting input terminal, and when the first output signal is greater than the reference signal Vref, the comparator A2 outputs a high power. Flat; when the first output signal is smaller than the reference signal Vref, the output of the comparator A2 Low level.
  • the reference signal Vref of the comparator A2 can be provided by other circuits or devices.
  • the PWM control circuit 2031 generates a PWM signal that can control the duty ratio of the switch tube according to the second output signal output by the comparator A2, and outputs the PWM signal to the control end of the switch tube Q1.
  • the larger the duty ratio the longer the switching transistor Q1 is turned on in one cycle.
  • the time during which the switching transistor Q1 is turned on can be controlled, thereby controlling the time for compensating the output signal of the power management chip U1 to stabilize the output signal.
  • the switch tube may be a field effect transistor or a triode.
  • the switch tube may be a MOS tube.
  • the feedback control circuit 20 may be integrated inside the power management chip U1 or connected outside the power management chip.
  • the feedback control circuit includes a sampling analysis circuit, a comparison circuit, and a switch tube control circuit.
  • the sampling analysis circuit can sample the output signal of the power management chip and analyze the change trend of the output signal to obtain a first output signal, and the comparison circuit. Comparing the first output signal with the reference signal to obtain a second output signal, and the PWM control circuit in the switch tube control circuit generates a PWM signal according to the second output signal, and adjusts a duty ratio of the switch tube connected to the power management chip to Adjust the compensation time for the output signal of the power management chip. Due to the simple circuit structure, the change of the output signal of the power management chip can be reflected to the switching tube control circuit in time, thereby shortening the response time of the feedback, reducing the ripple of the output signal, and improving the output stability of the power management chip.
  • FIG. 3 is a schematic structural diagram of a power management module according to an embodiment of the present invention.
  • the power management module 30 can include a power management chip 301 and a feedback control circuit 302.
  • the feedback control circuit 302 can include a sample analysis circuit 3021, a comparison circuit 3022, and a switch control circuit 3023.
  • the feedback control circuit 302 may be integrated inside the power management chip 301 or may be external to the power management chip 301.
  • the sampling analysis circuit 3021 is connected to the power management chip 301 for sampling the output signal of the power management chip 301, and analyzing the change trend of the output signal to obtain a first output signal.
  • the output signal of the power management chip 301 may be a voltage signal or a current signal.
  • the sampling analysis circuit 3021 may be a differential circuit.
  • the output signal of the differential circuit is proportional to the rate of change of the input signal.
  • the differential circuit can obtain the slope of the output signal change of the power management chip 301, which is the first output signal.
  • the comparison circuit 3022 is connected to the sampling analysis circuit 3021 and the switch control circuit 3023 for comparing the first output signal with the reference signal to obtain a second output signal.
  • the second output signal may be a high level or a low level.
  • the comparison circuit 3022 can compare the first output signal with the reference signal and output a high/low level according to the comparison result. For example, if the first output signal is greater than the reference signal, the comparison circuit 3022 outputs a high level, otherwise the comparison circuit 3022 outputs a low level.
  • the reference signal of the comparison circuit 3022 can be provided by other circuits or devices.
  • the switch tube control circuit 3023 includes a pulse width modulation PWM control circuit and a switch tube, wherein the PWM control circuit is connected to the comparison circuit 3022 and the switch tube, the switch tube is connected to the power management chip, and the switch tube control circuit 3023 is used. Adjusting a duty cycle of the switch tube according to the second output signal to adjust a compensation time of an output signal of the power management chip.
  • the input end of the PWM control circuit is connected to the output end of the comparison circuit 3022, and the output end of the PWM control circuit is connected to the switch tube.
  • the PWM control circuit generates a PWM signal that can control the duty ratio of the switch tube according to the second output signal output by the comparison circuit 3022, and outputs the PWM signal to the control end of the switch tube.
  • the larger the duty cycle the longer the switch is turned on in one cycle.
  • the switch tube may be a field effect transistor or a triode.
  • the switch tube may be a MOS tube.
  • the power management module includes a feedback control circuit
  • the feedback control circuit includes a sampling analysis circuit, a comparison circuit, and a switch tube control circuit.
  • the sampling analysis circuit can sample the output signal of the power management chip and analyze the change trend of the output signal. Obtaining a first output signal, the comparison circuit compares the first output signal with the reference signal to obtain a second output signal, and the PWM control circuit in the switch tube control circuit generates a PWM signal according to the second output signal, and adjusts the connection with the power management chip.
  • the duty cycle of the switch tube to adjust the compensation time for the output signal of the power management chip. Due to the simple circuit structure, the change of the output signal of the power management chip can be reflected to the switching tube control circuit in time, thereby shortening the response time of the feedback, reducing the ripple of the output signal, and improving the output stability of the power management chip.
  • the power management module 40 can include a power management chip 401, a feedback control circuit 402, and an external The control circuit 403, wherein the feedback control circuit 402 can include a sample analysis circuit 4021, a comparison circuit 4022, and a switch control circuit 4023.
  • the switch control circuit 403 includes a PWM control circuit 4031 and a switch Q1.
  • the feedback control circuit 402 can be integrated inside the power management chip 401 or external to the power management chip 401.
  • circuit structure and implementation manner of the feedback control circuit 402 can be referred to the related description of the embodiment shown in FIG. 2, and details are not described herein.
  • the power management chip 401 may include, but is not limited to, a MAX 17409 chip, a MAX749 chip, a BQ24010 DRCR chip, an HX5562R11U chip, and the like.
  • FIG. 4 illustrates the HX5562R11U chip as an example.
  • the peripheral control circuit 403 is connected to the outside of the power management chip 401, and can protect the power management chip 401 from overvoltage protection, undervoltage protection, overcurrent protection, overtemperature protection, etc., to ensure the power management chip 401. Stable work.
  • the power management module of the embodiment of the present invention can shorten the feedback response time of the power management chip, reduce the ripple of the output signal of the power management chip, and improve the output stability of the power management chip.

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Abstract

一种反馈控制电路（10）及电源管理模块，其中反馈控制电路（10）可包括采样分析电路（101）、比较电路（102）和开关管控制电路（103），采样分析电路（101）连接电源管理芯片，用于采样电源管理芯片的输出信号，并分析输出信号的变化趋势，得到第一输出信号；比较电路（102）连接采样分析电路（101）和开关管控制电路（103），用于比较第一输出信号与参考信号，得到第二输出信号；开关管控制电路（103）包括脉冲宽度调制PWM控制电路和开关管，其中PWM控制电路连接比较电路（102）和开关管，开关管连接电源管理芯片，开关管控制电路（103）用于根据第二输出信号调整开关管的占空比，以调整对电源管理芯片的输出信号的补偿时间。采用这种反馈控制电路及电源管理模块，可减小电源管理芯片的输出信号的纹波，提高电源管理芯片的输出稳定性。

Description

一种反馈控制电路及电源管理模块
本发明要求2015年12月21日递交的发明名称为“一种反馈控制电路及电源管理模块”的申请号201510967353.3的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及集成电路领域，尤其涉及一种反馈控制电路及电源管理模块。
背景技术
电源管理芯片(Power Management IC，简称PMIC)通常应用于各类电子设备中，用于将各种电源有效分配给电子设备中的不同单元，使这些单元能够正常工作。为使在负载变化的情况下仍能输出稳定的电压，通常情况下PMIC设置有反馈电路，反馈电路能检测PMIC的输出电压/输出电流的变化，并根据该变化对PMIC的输出电压/输出电流进行补偿，以维持输出电压/输出电流的稳定。
在实际应用中，反馈电路从检测PMIC的输出信号到对其进行补偿，中间需要一定的响应时间。现有的反馈电路虽然能根据负载变化对PMIC的输出信号进行补偿，但是无论负载如何变化，其响应时间都是固定的，并不会随着负载变化而变化。然而当负载变化较快时，重载条件下响应时间较长会导致输出纹波较大，可能引起电磁兼容问题。
发明内容
本发明实施例提供一种反馈控制电路及电源管理模块，可缩短电源管理芯片的反馈响应时间，减小电源管理芯片的输出信号的纹波，提高电源管理芯片的输出稳定性。
本发明实施例第一方面提供一种反馈控制电路，所述反馈控制电路包括采样分析电路、比较电路和开关管控制电路，其中：
所述采样分析电路连接电源管理芯片，用于采样所述电源管理芯片的输出信号，并分析所述输出信号的变化趋势，得到第一输出信号；
所述比较电路连接所述采样分析电路和所述开关管控制电路，用于比较所述第一输出信号与参考信号，得到第二输出信号；
所述开关管控制电路包括脉冲宽度调制PWM控制电路和开关管，其中所述PWM控制电路连接所述比较电路和所述开关管，所述开关管连接所述电源管理芯片，所述开关管控制电路用于根据所述第二输出信号调整所述开关管的占空比，以调整对所述电源管理芯片的输出信号的补偿时间。
在一些可行的实施方式中，所述采样分析电路为微分电路，用于对所述输出信号进行微分运算，得到所述输出信号的斜率，所述输出电路的斜率为所述第一输出信号。
在一些可行的实施方式中，所述微分电路包括第一运算放大器、第一电容、第一电阻和第二电阻，其中：
所述第一运算放大器的反相输入端依次通过串联的所述第一电容和所述第一电阻连接所述电源管理芯片的输出引脚，所述第一运算放大器的同相输入端接地，所述第一运算放大器的输出端连接所述比较电路并通过所述第二电阻连接所述第一运算放大器的反相输入端。
在一些可行的实施方式中，所述比较电路的同相输入端连接所述采样分析电路的输出端，所述比较电路的反相输入端接入所述参考信号，所述比较电路的输出端连接所述PWM控制电路。
在一些可行的实施方式中，所述比较电路用于：
当所述第一输出信号大于所述参考信号时，输出高电平；
当所述第一输出信号小于所述参考信号时，输出低电平。
在一些可行的实施方式中，所述PWM控制电路的输入端连接所述比较电路的输出端；所述PWM控制电路的输出端连接所述开关管的第一端；
所述开关管的第二端连接所述电源管理芯片的输出引脚，所述开关管的第三端接地。
在一些可行的实施方式中，所述开关管为金属氧化物半导体MOS管。
本发明实施例第二方面提供一种电源管理模块，所述电源管理模块包括电源管理芯片和如第一方面或第一方面任一种可行的实施方式所述的反馈控制电路。
在一些可行的实施方式中，所述电源管理模块还包括上述电源管理芯片的 外围控制电路。
本发明实施例中，反馈控制电路包括采样分析电路、比较电路和开关管控制电路，采样分析电路可采样电源管理芯片的输出信号并分析该输出信号的变化趋势，得到第一输出信号，比较电路将第一输出信号与参考信号进行比较，得到第二输出信号，开关管控制电路中的PWM控制电路根据第二输出信号生成PWM信号，调整与电源管理芯片连接的开关管的占空比，以调整对电源管理芯片的输出信号的补偿时间。由于电路结构简单，电源管理芯片的输出信号的变化能及时反映至开关管控制电路，从而可缩短反馈的响应时间，减小输出信号的纹波。
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性的前提下，还可以根据这些附图获得其他的附图。
图1是本发明的一个实施例提供的反馈控制电路的结构示意图；
图2是本发明的一个实施例提供的反馈控制电路的电路图；
图3是本发明的一个实施例提供的电源管理模块的结构示意图；
图4是本发明的一个实施例提供的电源管理模块的电路图。
具体实施方式
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。
本发明实施例提供一种反馈控制电路及电源管理模块，可缩短电源管理芯片的反馈响应时间，减小电源管理芯片的输出信号的纹波，提高电源管理芯片的输出稳定性。以下将结合附图进行详细说明。
参见图1，为本发明的一个实施例提供的反馈控制电路的结构示意图。其中所述反馈控制电路10应用于电源管理芯片。如图1所示，所述反馈控制电 路可包括采样分析电路101、比较电路102和开关管控制电路103，其中：
采样分析电路101连接电源管理芯片，用于采样所述电源管理芯片的输出信号，并分析所述输出信号的变化趋势，得到第一输出信号。
可选地，电源管理芯片的输出信号可以为电压信号或电流信号。
在一些可行的实施方式中，采样分析电路101可以是微分电路，微分电路的输出信号与输入信号的变化率成正比，当微分电路的输入信号即电源管理芯片的输出信号发生变化时，通过微分电路可得到电源管理芯片的输出信号变化的斜率，该斜率即为第一输出信号。
比较电路102连接采样分析电路101和开关管控制电路103，用于比较所述第一输出信号与参考信号，得到第二输出信号。
具体实施中，第二输出信号可以为高电平或低电平。比较电路102可将上述第一输出信号与参考信号进行比较，根据比较结果输出高/低电平。例如，若上述第一输出信号大于参考信号，比较电路102输出高电平，否则比较电路102输出低电平。其中，比较电路102的参考信号可以由其他电路或装置提供。
开关管控制电路103包括脉冲宽度调制(Pulse Width Modulation，简称PWM)控制电路和开关管，其中所述PWM控制电路连接比较电路102和所述开关管，所述开关管连接所述电源管理芯片，开关管控制电路103用于根据所述第二输出信号调整所述开关管的占空比，以调整对所述电源管理芯片的输出信号的补偿时间。
具体实施中，PWM控制电路的输入端连接比较电路102的输出端，PWM控制电路的输出端连接开关管。PWM控制电路根据比较电路102输出的第二输出信号生成可控制开关管占空比的PWM信号，并将该PWM信号输出至开关管的控制端。占空比越大，开关管在一个周期内导通的时间越长。通过控制开关管的占空比可控制开关管导通的时间，进而控制对电源管理芯片的输出信号进行补偿的时间，以达到稳定上述输出信号。
可选地，上述开关管可以是场效应晶体管或三极管，优选的，上述开关管可以是MOS管。
本发明实施例中，反馈控制电路包括采样分析电路、比较电路和开关管控制电路，采样分析电路可采样电源管理芯片的输出信号并分析该输出信号的变化趋势，得到第一输出信号，比较电路将第一输出信号与参考信号进行比较， 得到第二输出信号，开关管控制电路中的PWM控制电路根据第二输出信号生成PWM信号，调整与电源管理芯片连接的开关管的占空比，以调整对电源管理芯片的输出信号的补偿时间。由于电路结构简单，电源管理芯片的输出信号的变化能及时反映至开关管控制电路，从而可缩短反馈的响应时间，减小输出信号的纹波，提高电源管理芯片的输出稳定性。
参见图2，为本发明的一个实施例提供的反馈控制电路的结构示意图。所述反馈控制电路20可应用于电源管理芯片U1。如图2所示，所述反馈控制电路可包括采样分析电路201、比较电路202和开关管控制电路203，其中开关管控制电路203包括PWM控制电路2031和开关管Q1。
采样分析电路201包括第一运算放大器A1、第一电容C1、第一电阻R1和第二电阻R2，第一运算放大器A1的反相输入端依次通过串联的所述第一电容C1和所述第一电阻R1连接所述电源管理芯片U1的输出引脚，所述第一运算放大器A1的同相输入端接地，所述第一运算放大器A1的输出端连接所述比较电路202并通过所述第二电阻R2连接所述第一运算放大器A1的反相输入端。
具体实施中，采样分析电路201中的第一运算放大器A1、第一电容C1和第一电阻R1构成微分电路，微分电路的输出信号与输入信号的变化率成正比，当微分电路的输入信号(即电源管理芯片的输出信号)发生变化时，通过微分电路可得到电源管理芯片的输出信号变化的斜率，该斜率即为第一输出信号。
可选地，电源管理芯片的输出信号可以为电压信号或电流信号。
比较电路202通过比较器A2实现，比较器A2的同相输入端连接第一运算放大器A1的输出端(即采样分析电路201的输出端)，比较器A2的反相输入端接入参考信号Vref，比较器A2的输出端连接PWM控制电路2031的输入端。PWM控制电路2031的输出端连接开关管Q1的控制端(即第一端)。开关管Q1的第二端和第三端分别连接电源管理芯片和接地。
在一些可行的实施方式中，第二输出信号可以为高电平或低电平。比较器A2将采样分析电路201输出的第一输出信号与从反相输入端接入的参考信号Vref进行比较，当所述第一输出信号大于所述参考信号Vref时，比较器A2输出高电平；当所述第一输出信号小于所述参考信号Vref时，比较器A2输出 低电平。其中，比较器A2的参考信号Vref可以由其他电路或装置提供。
具体实施中，PWM控制电路2031根据比较器A2输出的第二输出信号生成可控制开关管占空比的PWM信号，并将该PWM信号输出至开关管Q1的控制端。占空比越大，开关管Q1在一个周期内导通的时间越长。通过控制开关管Q1的占空比可控制开关管Q1导通的时间，进而控制对电源管理芯片U1的输出信号进行补偿的时间，以达到稳定上述输出信号的作用。
可选地，上述开关管可以是场效应晶体管或三极管，优选的，上述开关管可以是MOS管。
可选地，所述反馈控制电路20可集成在电源管理芯片U1内部，或者连接在电源管理芯片外部。
本发明实施例中，反馈控制电路包括采样分析电路、比较电路和开关管控制电路，采样分析电路可采样电源管理芯片的输出信号并分析该输出信号的变化趋势，得到第一输出信号，比较电路将第一输出信号与参考信号进行比较，得到第二输出信号，开关管控制电路中的PWM控制电路根据第二输出信号生成PWM信号，调整与电源管理芯片连接的开关管的占空比，以调整对电源管理芯片的输出信号的补偿时间。由于电路结构简单，电源管理芯片的输出信号的变化能及时反映至开关管控制电路，从而可缩短反馈的响应时间，减小输出信号的纹波，提高电源管理芯片的输出稳定性。
参见图3，为本发明的一个实施例提供的电源管理模块的结构示意图。如图3所示，所述电源管理模块30可包括电源管理芯片301和反馈控制电路302，其中反馈控制电路302可包括采样分析电路3021、比较电路3022和开关管控制电路3023。反馈控制电路302可以集成在电源管理芯片301内部，也可以连接在电源管理芯片301外部。
采样分析电路3021连接电源管理芯片301，用于采样所述电源管理芯片301的输出信号，并分析所述输出信号的变化趋势，得到第一输出信号。
可选地，电源管理芯片301的输出信号可以为电压信号或电流信号。
在一些可行的实施方式中，采样分析电路3021可以是微分电路，微分电路的输出信号与输入信号的变化率成正比，当微分电路的输入信号即电源管理芯片301的输出信号发生变化时，通过微分电路可得到电源管理芯片301的输出信号变化的斜率，该斜率即为第一输出信号。
比较电路3022连接采样分析电路3021和开关管控制电路3023，用于比较所述第一输出信号与参考信号，得到第二输出信号。
具体实施中，第二输出信号可以为高电平或低电平。比较电路3022可将上述第一输出信号与参考信号进行比较，根据比较结果输出高/低电平。例如，若上述第一输出信号大于参考信号，比较电路3022输出高电平，否则比较电路3022输出低电平。其中，比较电路3022的参考信号可以由其他电路或装置提供。
开关管控制电路3023包括脉冲宽度调制PWM控制电路和开关管，其中所述PWM控制电路连接比较电路3022和所述开关管，所述开关管连接所述电源管理芯片，开关管控制电路3023用于根据所述第二输出信号调整所述开关管的占空比，以调整对所述电源管理芯片的输出信号的补偿时间。
具体实施中，PWM控制电路的输入端连接比较电路3022的输出端，PWM控制电路的输出端连接开关管。PWM控制电路根据比较电路3022输出的第二输出信号生成可控制开关管占空比的PWM信号，并将该PWM信号输出至开关管的控制端。占空比越大，开关管在一个周期内导通的时间越长。通过控制开关管的占空比可控制开关管导通的时间，进而控制对电源管理芯片的输出信号进行补偿的时间，以达到稳定上述输出信号。
可选地，上述开关管可以是场效应晶体管或三极管，优选的，上述开关管可以是MOS管。
本发明实施例中，电源管理模块包括反馈控制电路，反馈控制电路包括采样分析电路、比较电路和开关管控制电路，采样分析电路可采样电源管理芯片的输出信号并分析该输出信号的变化趋势，得到第一输出信号，比较电路将第一输出信号与参考信号进行比较，得到第二输出信号，开关管控制电路中的PWM控制电路根据第二输出信号生成PWM信号，调整与电源管理芯片连接的开关管的占空比，以调整对电源管理芯片的输出信号的补偿时间。由于电路结构简单，电源管理芯片的输出信号的变化能及时反映至开关管控制电路，从而可缩短反馈的响应时间，减小输出信号的纹波，提高电源管理芯片的输出稳定性。
参见图4，为本发明的一个实施例提供的电源管理模块的电路图。如图4所示，该电源管理模块40可包括电源管理芯片401、反馈控制电路402和外 围控制电路403，其中反馈控制电路402可包括采样分析电路4021、比较电路4022和开关管控制电路4023。其中开关管控制电路403包括PWM控制电路4031和开关管Q1，反馈控制电路402可以集成在电源管理芯片401内部，也可以连接在电源管理芯片401外部。
具体实施中，反馈控制电路402的电路结构及实现方式可参考图2所示实施例的相关描述，在此不赘述。
在一些可行的实施方式中，电源管理芯片401可包括但不限于MAX 17409芯片、MAX749芯片、BQ24010DRCR芯片、HX5562R11U芯片等，其中图4以HX5562R11U芯片为例进行说明。
具体实施中，外围控制电路403连接在电源管理芯片401外部，可对电源管理芯片401起到过压保护、欠压保护、过流保护、过温保护等保护作用，以保证电源管理芯片401的稳定工作。
根据图2的相关描述可知，本发明实施例的电源管理模块，可缩短电源管理芯片的反馈响应时间，减小电源管理芯片的输出信号的纹波，提高电源管理芯片的输出稳定性。
以上所述的实施方式，并不构成对该技术方案保护范围的限定。任何在上述实施方式的精神和原则之内所作的修改、等同替换和改进等，均应包含在该技术方案的保护范围之内。

Claims (16)

  1. 一种反馈控制电路，其中，所述反馈控制电路包括采样分析电路、比较电路和开关管控制电路，其中：
    所述采样分析电路连接电源管理芯片，用于采样所述电源管理芯片的输出信号，并分析所述输出信号的变化趋势，得到第一输出信号；
    所述比较电路连接所述采样分析电路和所述开关管控制电路，用于比较所述第一输出信号与参考信号，得到第二输出信号；
    所述开关管控制电路包括脉冲宽度调制PWM控制电路和开关管，其中所述PWM控制电路连接所述比较电路和所述开关管，所述开关管连接所述电源管理芯片，所述开关管控制电路用于根据所述第二输出信号调整所述开关管的占空比，以调整对所述电源管理芯片的输出信号的补偿时间。
  2. 根据权利要求1所述的反馈控制电路，其中，所述采样分析电路为微分电路，用于对所述输出信号进行微分运算，得到所述输出信号的斜率，所述输出电路的斜率为所述第一输出信号。
  3. 根据权利要求2所述的反馈控制电路，其中，所述微分电路包括第一运算放大器、第一电容、第一电阻和第二电阻，其中：
    所述第一运算放大器的反相输入端依次通过串联的所述第一电容和所述第一电阻连接所述电源管理芯片的输出引脚，所述第一运算放大器的同相输入端接地，所述第一运算放大器的输出端连接所述比较电路并通过所述第二电阻连接所述第一运算放大器的反相输入端。
  4. 根据权利要求1所述的反馈控制电路，其中，所述比较电路的同相输入端连接所述采样分析电路的输出端，所述比较电路的反相输入端接入所述参考信号，所述比较电路的输出端连接所述PWM控制电路。
  5. 根据权利要求4所述的反馈控制电路，其中，所述比较电路用于：
    当所述第一输出信号大于所述参考信号时，输出高电平；
    当所述第一输出信号小于所述参考信号时，输出低电平。
  6. 根据权利要求1所述的反馈控制电路，其中，所述PWM控制电路的输入端连接所述比较电路的输出端；所述PWM控制电路的输出端连接所述开关管的第一端；
    所述开关管的第二端连接所述电源管理芯片的输出引脚，所述开关管的第三端接地。
  7. 根据权利要求6所述的反馈控制电路，其中，所述开关管为金属氧化物半导体MOS管。
  8. 一种电源管理模块，其中，所述电源管理模块包括电源管理芯片和反馈控制电路，所述反馈控制电路包括采样分析电路、比较电路和开关管控制电路，其中：
    所述采样分析电路连接电源管理芯片，用于采样所述电源管理芯片的输出信号，并分析所述输出信号的变化趋势，得到第一输出信号；
    所述比较电路连接所述采样分析电路和所述开关管控制电路，用于比较所述第一输出信号与参考信号，得到第二输出信号；
    所述开关管控制电路包括脉冲宽度调制PWM控制电路和开关管，其中所述PWM控制电路连接所述比较电路和所述开关管，所述开关管连接所述电源管理芯片，所述开关管控制电路用于根据所述第二输出信号调整所述开关管的占空比，以调整对所述电源管理芯片的输出信号的补偿时间。
  9. 根据权利要求8所述的电源管理模块，其中，所述采样分析电路为微分电路，用于对所述输出信号进行微分运算，得到所述输出信号的斜率，所述输出电路的斜率为所述第一输出信号。
  10. 根据权利要求9所述的电源管理模块，其中，所述微分电路包括第一运算放大器、第一电容、第一电阻和第二电阻，其中：
    所述第一运算放大器的反相输入端依次通过串联的所述第一电容和所述 第一电阻连接所述电源管理芯片的输出引脚，所述第一运算放大器的同相输入端接地，所述第一运算放大器的输出端连接所述比较电路并通过所述第二电阻连接所述第一运算放大器的反相输入端。
  11. 根据权利要求8所述的电源管理模块，其中，所述比较电路的同相输入端连接所述采样分析电路的输出端，所述比较电路的反相输入端接入所述参考信号，所述比较电路的输出端连接所述PWM控制电路。
  12. 根据权利要求11所述的电源管理模块，其中，所述比较电路用于：
    当所述第一输出信号大于所述参考信号时，输出高电平；
    当所述第一输出信号小于所述参考信号时，输出低电平。
  13. 根据权利要求8所述的电源管理模块，其中，所述PWM控制电路的输入端连接所述比较电路的输出端；所述PWM控制电路的输出端连接所述开关管的第一端；
    所述开关管的第二端连接所述电源管理芯片的输出引脚，所述开关管的第三端接地。
  14. 根据权利要求13所述的电源管理模块，其中，所述开关管为金属氧化物半导体MOS管。
  15. 根据权利要求8所述的电源管理模块，其中，所述电源管理芯片的反馈控制电路集成于所述电源管理芯片内部。
  16. 根据权利要求8所述的电源管理模块，其中，所述电源管理模块还包括所述电源管理芯片的外围控制电路。
PCT/CN2016/070915 2015-12-21 2016-01-14 一种反馈控制电路及电源管理模块 Ceased WO2017107267A1 (zh)

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