WO2023147745A1 - 纹波电压处理装置及方法和开关电源 - Google Patents

纹波电压处理装置及方法和开关电源 Download PDF

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Publication number
WO2023147745A1
WO2023147745A1 PCT/CN2022/140153 CN2022140153W WO2023147745A1 WO 2023147745 A1 WO2023147745 A1 WO 2023147745A1 CN 2022140153 W CN2022140153 W CN 2022140153W WO 2023147745 A1 WO2023147745 A1 WO 2023147745A1
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power supply
switching
switching power
processing device
ripple voltage
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PCT/CN2022/140153
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English (en)
French (fr)
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WO2023147745A9 (zh
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彭博
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Oppo广东移动通信有限公司
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Publication of WO2023147745A1 publication Critical patent/WO2023147745A1/zh
Publication of WO2023147745A9 publication Critical patent/WO2023147745A9/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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • This application relates to but not limited to electronic technology, especially to a ripple voltage processing device and method and switching power supply.
  • Switching power supply is the abbreviation of switching regulated power supply. In actual use, due to the switching action (switching frequency) of the switching power supply, it will cause fluctuations in the output DC voltage, which can be called switching noise. Switching noise will cause the switching power supply to output ripple voltage, and ripple is a kind of noise harmful to the circuit, which will cause the voltage supplied by the switching power supply to the load to be unstable.
  • the present application provides a ripple voltage processing device and method and a switching power supply, which can effectively remove voltage ripples and ensure a stable output voltage of the switching power supply.
  • An embodiment of the present application provides a ripple voltage processing device, including: a first controller, an adjustable filter, and a memory; wherein,
  • the corresponding relationship between frequency information and adjustment parameters is stored in the memory; the memory is used to receive and store the current switching operating frequency information from the switching power supply;
  • the first controller is configured to read the current switch operating frequency information from the memory; query the corresponding relationship to obtain the adjustment parameters corresponding to the current switch operating frequency information;
  • the above adjustable filter is controlled;
  • the adjustable filter is configured to adjust the filtering frequency to the current switching operating frequency according to the control of the first controller, so as to filter out the output voltage corresponding to the current switching operating frequency in the output voltage of the switching power supply. switching noise.
  • the embodiments of the present application further provide a switching power supply, including any one of the ripple voltage processing devices provided in the embodiments of the present application.
  • the embodiment of the present application provides another ripple voltage processing method, which is applied to electronic equipment provided with the ripple voltage processing device described in any one of claims 1 to 4, including:
  • the memory in the ripple voltage processing device obtains the current switching frequency information of the switching power supply
  • the first controller in the ripple voltage processing device determines an adjustment parameter according to the current switching frequency information
  • the first controller in the ripple voltage processing device controls the adjustable filter in the ripple voltage processing device according to the determined adjustment parameter, and adjusts the filter frequency to the current switching operating frequency, The switching noise corresponding to the current switching operating frequency in the output voltage of the switching power supply is filtered out.
  • the embodiment of the present application automatically adjusts the filtering frequency for the switching noise frequency brought by the current switching frequency of the switching power supply, and performs filtering processing on the output voltage of the switching power supply in real time, effectively eliminating The voltage ripple ensures a stable output voltage of the switching power supply.
  • Fig. 1 is the waveform schematic diagram in the embodiment of PWM control mode
  • FIG. 2 is a schematic diagram of waveforms in an embodiment of a PFM control mode
  • FIG. 3 is a schematic diagram of the composition and structure of a switching power supply
  • Fig. 4 is a schematic diagram of the circuit composition structure of a step-down switching power supply
  • FIG. 5 is a schematic diagram of the composition and structure of the ripple voltage processing device in the embodiment of the present application.
  • FIG. 6 is a schematic diagram of Embodiment 1 of an application scenario of a ripple voltage processing device in an embodiment of the present application
  • Embodiment 7 is a schematic diagram of Embodiment 2 of the application scenario of the ripple voltage processing device in the embodiment of the present application;
  • FIG. 8 is a schematic diagram of Embodiment 3 of the application scenario of the ripple voltage processing device in the embodiment of the present application.
  • FIG. 9 is a schematic diagram of Embodiment 4 of the application scenario of the ripple voltage processing device in the embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a ripple voltage processing method in an embodiment of the present application.
  • first and second used in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as “first” and “second” may explicitly or implicitly include at least one of these features. In the description of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • connection in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have the transmission of electrical signals or data between each other.
  • a switching power supply is a power supply that uses modern power electronics technology to maintain a stable output voltage by controlling the time ratio (and duty cycle) of the switch tube being turned on and off.
  • the switching power supply may include a direct current-direct current (DC-DC) switching power supply, an alternating current-direct current (AC-DC) switching power supply.
  • DC-DC direct current-direct current
  • AC-DC alternating current-direct current
  • PWM pulse width modulation
  • PFM pulse frequency modulation
  • PFM Pulse Frequency Modulation
  • the duty cycle of the pulse modulation signal can be increased, that is, as shown in the figure As shown in 1, the output voltage value of the switching power supply can be kept constant by increasing the time ratio of the switch in the switching power supply; if the output voltage of the switching power supply becomes higher, it means that the load becomes lighter, then the pulse modulation signal can be reduced Duty cycle, that is, as shown in FIG. 1 , the output voltage value of the switching power supply can be maintained constant by reducing the proportion of the time that the switch is turned on.
  • FIG. 3 is a schematic diagram of the composition and structure of a switching power supply.
  • the switching power supply 20 may at least include: a switching circuit 202, a monitoring circuit 200, a pulse modulation control circuit 201, and a circuit 203 composed of capacitors and inductors; wherein,
  • a monitoring circuit 200 configured to monitor the output voltage Vout1 of the switching power supply 20;
  • the pulse modulation control circuit 201 is used to generate the switching operating frequency through the pulse modulation control mode according to the monitored output voltage Vout1, and control the switching on or off of the switching circuit 202;
  • the switch circuit 202 is configured to perform a turn-on or turn-off action according to the switching operating frequency under the control of the pulse modulation control circuit 201, so as to maintain a stable output voltage value of the switching power supply 20;
  • a circuit composed of capacitors and inductors is used to output a stable output voltage.
  • FIG. 4 is a schematic diagram of the circuit structure of a step-down (buck) switching power supply.
  • FIG. 4 shows a scene where a DC power supply (namely Vin) supplies power to a load RL.
  • the monitoring circuit 200 and the pulse modulation control circuit 201 are configured to monitor the output voltage Vout1, and according to the monitored output voltage Vout1, control methods such as PWM and PFM are used to control the switching power supply.
  • the switching circuit 202 is turned on and off time ratio, that is, the duty cycle is controlled, so as to maintain the feedback system of the output voltage value of the switching power supply unchanged.
  • FIG. 4 shows a schematic diagram of the circuit structure of a step-down (buck) switching power supply.
  • FIG. 4 shows a scene where a DC power supply (namely Vin) supplies power to a load RL.
  • the monitoring circuit 200 and the pulse modulation control circuit 201 are configured to monitor the output voltage Vout1, and according to the monitored output voltage Vout1, control methods such as PWM and PFM are used to control the switching
  • the step-down principle is to continuously control the on and off of the switch S1 and the switch S2 , and combine with the energy storage inductor L1 to provide a stable output voltage Vout1 after step-down.
  • Its output voltage Vout1 Vin*duty cycle, wherein, Vin is the input DC voltage, and the duty cycle is the ratio of the switch-on time to a complete modulation cycle.
  • Vin is the input DC voltage
  • the duty cycle is the ratio of the switch-on time to a complete modulation cycle.
  • the switching noise frequency will also become unstable. How to accurately and effectively filter the noise generated by the switching, so as to stabilize the power supply voltage and improve system performance is an urgent problem to be solved.
  • Fig. 5 is a schematic diagram of the composition and structure of the ripple voltage processing device in the embodiment of the present application.
  • the ripple voltage processing device 10 at least includes: a first controller 100, an adjustable filter 101, and a memory 102; wherein,
  • a memory 102 wherein the corresponding relationship between frequency information and adjustment parameters is stored; the memory 102 is used to receive and store current switching operating frequency information from the switching power supply 20;
  • the first controller 100 is used to read the current switching operating frequency information of the switching power supply 20 from the memory 102; query the corresponding relationship in the memory 102 to obtain the adjustment parameters corresponding to the current switching operating frequency information of the switching power supply 20; according to the obtained Adjusting parameters to control the adjustable filter 101;
  • the adjustable filter 101 is used to adjust the filtering frequency to the current switching frequency of the switching power supply 20 according to the control of the first controller 100, so as to filter out the switching noise corresponding to the current switching frequency in the output voltage of the switching power supply 20, That is, the noise on the switching frequency in the first output voltage V out1 output by the switching power supply 20 is filtered to obtain the second output voltage V out2 .
  • the ripple voltage processing device provided in the embodiment of the present application automatically adjusts the filter frequency for the switching noise frequency brought by the current switching frequency of the switching power supply according to the adjustment of the switching frequency of the switching power supply, and real-time output voltage of the switching power supply Filtering is performed to effectively remove the voltage ripple and ensure a stable output voltage of the switching power supply.
  • the memory 102 and the first controller 100 can be set separately, that is, they are independent entities; the memory 102 and the first controller 100 can also be combined and set to be the same entity, such as a storage unit with a belt Processor, or a power management chip (PMIC, Power Management IC), etc.
  • a storage unit with a belt Processor or a power management chip (PMIC, Power Management IC), etc.
  • PMIC Power Management IC
  • the filter can effectively filter the frequency point of a specific frequency in the power line or frequencies other than the frequency point, obtain a power signal of a specific frequency, or eliminate a power signal of a specific frequency.
  • the frequency points filtered out by the adjustable filter 101 in the embodiment of the present application are filters that can change as the adjustment parameters change.
  • the adjustable filter 101 can be adjusted by changing the voltage applied to the terminal.
  • Digitally controlled variable capacitors not varactor diodes
  • digitally programmable capacitors digitally programmable capacitors
  • adjustable digital filters etc. that change the capacitance value. As shown in FIG. 5, in combination with FIG.
  • the monitoring circuit 200 of the switching power supply 20 generates the first signal to control the internal switching circuit 202 of the switching power supply through the pulse modulation control circuit 201 according to the load condition.
  • switch operating frequency and store the first switching operating frequency in the memory 102;
  • the first controller 100 reads the first switching operating frequency from the memory 102, and queries the corresponding relationship in the memory 102 to obtain the first switching operating frequency corresponding to the first adjustment parameter;
  • the first controller 100 controls the adjustable filter 101 according to the obtained first adjustment parameter;
  • the adjustable filter 101 adjusts the filter frequency to the first switch according to the control of the first controller 100
  • the operating frequency is used to filter the noise on the first switching operating frequency in the first output voltage V out1 output by the switching power supply 20 to obtain the second output voltage V out2 .
  • the monitoring circuit 200 of the switching power supply 20 will detect the change of the load, and generate and control the second switching frequency of the internal circuit 202 of the switching power supply through the pulse modulation control circuit 201 to meet the load demand, and the adjusted first
  • the second switching operating frequency is stored in the memory 102; after the first controller 100 of the ripple voltage processing device reads the changed second switching operating frequency from the memory 102, the second switching operating frequency is obtained by querying the corresponding relationship in the memory 102.
  • the filtering frequency of the adjustable filter 101 will be adjusted accordingly to filter out the noise generated by the corresponding switch in the output voltage of the switching power supply.
  • the ripple voltage processing device provided by the embodiment of the present application can be used as an independent device, as shown in Figure 6; it can also be set in a switching power supply, as shown in Figure 7; it can also be set in a switch In the load of the power supply, as shown in Figure 8.
  • an embodiment of the present application further provides a switching power supply, as shown in FIG. 7 , including the ripple voltage processing device described in any one of the present application.
  • the switching power supply 20 further includes: a switching circuit 202, a monitoring circuit 200, a pulse modulation control circuit 201, and a circuit 203 composed of capacitors and inductors; wherein,
  • a monitoring circuit 200 configured to monitor the first output voltage Vout1 of the circuit 203 formed by capacitance and inductance;
  • the pulse modulation control circuit 201 is used to generate the switching operating frequency through the pulse modulation control method according to the monitored first output voltage Vout1, and control the opening or closing of the switching circuit; and store the current switching operating frequency in the ripple In the memory 102 of the voltage processing device;
  • the switch circuit 202 is configured to perform a turn-on or turn-off action according to the switching operating frequency under the control of the pulse modulation control circuit 201, so as to maintain the stability of the first output voltage Vout1 of the circuit 203 composed of capacitance and inductance;
  • the circuit 201 composed of capacitors and inductors is used to output the voltage to the adjustable filter 101 of the ripple voltage processing device, so as to output a stable second output voltage Vout2 after filtering switching noise.
  • the DC-DC switching power supply 20 needs to provide a stable output DC voltage as power supply for the power amplifier (PA) of the load.
  • the first controller 100 is a PMIC and the tunable filter 101 is an antenna tuner (Tuner) as an example.
  • Tuner101 is composed of tapped inductance coil and variable capacitor, which can adjust its own capacitance value according to different voltage values.
  • the DC-DC switching power supply 10 supplies power to the PA. There will be switching noise on the power supply. The switching noise will affect the noise of the radio frequency signal. After being amplified by the PA, an intermodulation signal will be generated, resulting in the deterioration of the radio frequency performance index.
  • the frequency of the switching noise is related to the switching operating frequency.
  • the monitoring circuit 200 in the DC-DC switching power supply 20 passes the DC-DC switching power supply 20 according to the load condition.
  • the pulse modulation control circuit 201 in the DC-DC switching power supply 20 generates and controls the switching operating frequency of the internal switching circuit 202, and stores the current switching operating frequency in the memory 102;
  • the related parameters are the adjustment parameters, as shown in Table 1, the values of the related parameters of the switch operating frequency and the Tuner 101 in this embodiment are as follows.
  • the PMIC100 can read the current switching operating frequency from the memory 102 through the mobile industry processor interface (MIPI, Mobile Industry Processor Interface), and query the corresponding relationship in the memory 102 to obtain the relevant Tuner101 corresponding to the current switching operating frequency.
  • the value of the parameter; PMIC100 outputs the voltage value corresponding to the value of the relevant parameter of Tuner101 to Tuner101 according to the obtained value of relevant parameter of Tuner101, so as to control Tuner101.
  • the corresponding relationship between the values of the relevant parameters of the Tuner 101 shown in Table 2 and the corresponding voltage values stored in the PMIC 100 is taken as an example.
  • Tuner101 adjusts the corresponding capacitance value according to the control voltage of PMIC100.
  • the relationship between the control voltage of Tuner101 and the capacitance value is shown in Table 3.
  • the self-resonant frequency corresponding to the capacitance value is the frequency point of the current switching operating frequency. In this way, the noise at the switching frequency in the voltage output by the DC-DC switching power supply 20 is filtered out.
  • Fig. 10 is a schematic flow chart of the ripple voltage processing method in the embodiment of the present application, which is applied to electronic equipment provided with the ripple voltage processing device of the present application, as shown in Fig. 10 , including:
  • Step 100 The ripple voltage processing device acquires current switching frequency information of the switching power supply.
  • the method may further include: receiving and storing the current switching frequency information of the switching power supply.
  • the current switching operating frequency information of the switching power supply is generated by the switching power supply according to its own load conditions, and is used to control the switching on or off of the switch in the switching power supply.
  • the working frequency information of the pulse modulation signal is generated by the switching power supply according to its own load conditions, and is used to control the switching on or off of the switch in the switching power supply.
  • Step 101 The ripple voltage processing device determines an adjustment parameter according to the obtained current switching operating frequency information.
  • step 101 may further include: pre-storing the corresponding relationship between the frequency information and the adjustment parameter.
  • step 101 may include:
  • the corresponding relationship between the pre-stored frequency information and the adjustment parameters is queried to obtain the adjustment parameters corresponding to the current switch operating frequency information.
  • Step 102 The ripple voltage processing device adjusts the filtering frequency to the current switching operating frequency according to the determined adjustment parameters, so as to filter out the switching noise corresponding to the current switching operating frequency in the output voltage of the switching power supply.
  • the ripple voltage processing method provided by the embodiment of the present application automatically adjusts the filter frequency according to the adjustment of the switching frequency of the switching power supply to the switching noise frequency brought by the current switching frequency of the switching power supply, and the output voltage of the switching power supply is adjusted in real time. Filtering is performed to effectively remove the voltage ripple and ensure a stable output voltage of the switching power supply.

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Abstract

本申请公开了一种纹波电压处理装置及方法和开关电源，本申请实施例根据开关电源对其开关工作频率的调整，针对开关电源的当前开关工作频率带来的开关噪声频率，自动调整滤波频率，实时对开关电源的输出电压进行滤波处理，有效地去除了电压纹波，保证了开关电源输出稳定的电压。

Description

纹波电压处理装置及方法和开关电源 技术领域
本申请涉及但不限于电子技术，尤指一种纹波电压处理装置及方法和开关电源。
背景技术
开关电源是开关稳压电源的简称。在实际使用中，由于开关电源的开关动作(开关频率)，会引起输出直流电压的波动，这种波动可以称为开关噪声。开关噪声会使得开关电源输出纹波电压，而纹波是一种对电路有害的噪声，会造成开关电源供给负载的电压不稳定。
发明概述
本申请提供一种纹波电压处理装置及方法和开关电源，能够有效去除电压纹波，保证开关电源输出稳定的电压。
本申请实施例提供一种纹波电压处理装置，包括：第一控制器、可调滤波器、存储器；其中，
所述存储器中存储有频率信息与调节参数之间的对应关系；所述存储器用于接收并存储来自开关电源的当前开关工作频率信息；
所述第一控制器，用于从所述存储器中读取所述当前开关工作频率信息；查询所述对应关系，获得所述当前开关工作频率信息对应的调节参数；根据所述调节参数对所述可调滤波器进行控制；
所述可调滤波器，用于按照所述第一控制器的控制，将滤波频率调整为所述当前开关工作频率，以滤除所述开关电源的输出电压中对应所述当前开关工作频率的开关噪声。
本申请实施例提供还提供一种开关电源，包括本申请实施例提供的任一项所述的纹波电压处理装置。
本申请实施例提供再提供一种纹波电压处理方法，应用于设置有权利要求1～4任一项所述的纹波电压处理装置的电子设备中，包括：
所述纹波电压处理装置中的存储器获取开关电源的当前开关工作频率信 息；
所述纹波电压处理装置中的第一控制器根据所述当前开关工作频率信息确定调节参数；
所述纹波电压处理装置中的第一控制器按照确定的所述调节参数，对所述纹波电压处理装置中的可调滤波器进行控制，将滤波频率调整为所述当前开关工作频率，以滤除所述开关电源的输出电压中对应所述当前开关工作频率的开关噪声。
本申请实施例根据开关电源对其开关工作频率的调整，针对开关电源的当前开关工作频率带来的开关噪声频率，自动调整滤波频率，实时对开关电源的输出电压进行滤波处理，有效地去除了电压纹波，保证了开关电源输出稳定的电压。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图概述
附图用来提供对本申请技术方案的进一步理解，并且构成说明书的一部分，与本申请的实施例一起用于解释本申请的技术方案，并不构成对本申请技术方案的限制。
图1为PWM控制方式实施例中的波形示意图；
图2为PFM控制方式实施例中的波形示意图；
图3为一开关电源的组成结构示意图；
图4为一降压型开关电源的电路组成结构示意图；
图5为本申请实施例中纹波电压处理装置的组成结构示意图；
图6为本申请实施例中纹波电压处理装置的应用场景实施例一的示意图；
图7为本申请实施例中纹波电压处理装置的应用场景实施例二的示意图；
图8为本申请实施例中纹波电压处理装置的应用场景实施例三的示意图；
图9为本申请实施例中纹波电压处理装置的应用场景实施例四的示意图；
图10为本申请实施例中纹波电压处理方法的流程示意图。
详述
为使本申请的目的、技术方案和优点更加清楚明白，下文中将结合附图对本申请的实施例进行详细说明。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任意组合。
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使本申请的公开内容更加透彻全面。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。
可以理解，本申请所使用的术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是至少两个，例如两个、三个等，除非另有明确具体的限定。
可以理解，以下实施例中的“连接”，如果被连接的电路、模块、单元等相互之间具有电信号或数据的传递，则应理解为“电连接”、“通信连接”等。
在此使用时，单数形式的“一”、“一个”和“所述/该”也可以包括复数形式，除非上下文清楚指出另外的方式。还应当理解的是，术语“包括/包含”或“具有”等指定所陈述的特征、整体、步骤、操作、组件、部分或它们的组合的存在，但是不排除存在或添加一个或更多个其他特征、整体、步骤、操作、组件、部分或它们的组合的可能性。同时，在本说明书中使用的术语“和/或”包括相关所列项目的任何及所有组合。
开关电源是利用现代电力电子技术，通过控制开关管开通和关断的时间比率(及占空比)，来维持稳定输出电压的一种电源。开关电源可以包括直流-直流(DC-DC)开关电源、交流-直流(AC-DC)开关电源。
对于开关电源，如果想要在负载改变的情况下，维持输出电压不变，通常会有一个反馈系统，该反馈系统用于监测输出电压，并根据监测到的输出电压，采用如脉冲宽度调制(PWM，Pulse-Width Modulation)、脉冲频率调制(PFM，Pulse Frequency Modulation)等控制方式来控制开关电源中的开关管开通和关断的时间比率，从而维持开关电源的输出电压值不变。以PWM控制方式为例，在调制周期恒定的情况下，如果监测到开关电源的输出电压变低，意味着负载变重，那么，可以增加脉冲调制信号的占空比，也就是说，如图1所示，可以通过增加开关电源中开关开通的时间比例来维持开关电源的输出电压值不变；如果开关电源的输出电压变高，意味着负载变轻，那么，可以减小脉冲调制信号的占空比，也就是说，如图1所示，可以通过减少开关开通的时间比例来维持开关电源的输出电压值不变。以PFM控制方式为例，在开关开通时长固定的情况下，如果监测到开关电源的输出电压变低，意味着负载变重，那么，可以通过脉冲调制信号增加开关开通的次数，如图2所示，也即脉冲调制信号的频率会变高；如果监测到开关电源的输出电压变高，意味着负载变轻，那么，可以通过脉冲调制信号降低开关开通的次数，如图2所示，也即脉冲调制信号的频率会变低。
以DC-DC开关电源为例，一般由开关控制器芯片如脉冲调制控制电路、MOSFET开关、电感、电容等构成。图3为一开关电源的组成结构示意图，如图3所示，开关电源20至少可以包括：开关电路202、监测电路200、脉冲调制控制电路201、电容电感构成的电路203；其中，
监测电路200，用于监测开关电源20的输出电压Vout1；
脉冲调制控制电路201，用于根据监测到的输出电压Vout1，通过脉冲调制控制方式产生开关工作频率，对开关电路202的开通或关断进行控制；
开关电路202，用于在脉冲调制控制电路201的控制下，按照开关工作频率执行开通或关断动作，以维持开关电源20的输出电压值稳定；
电容电感构成的电路，用于输出稳定的输出电压。
图4为一降压型(buck)开关电源的电路组成结构示意图，图4中展示了DC电源(即Vin)向负载RL供电的场景。结合图3、图4所示，监测电路200和脉冲调制控制电路201，构成了用于监测输出电压Vout1，并根据监 测到的输出电压Vout1，采用如PWM、PFM等控制方式来控制开关电源中的开关电路202开通和关断的时间比率即控制占空比，从而维持开关电源的输出电压值不变的反馈系统。如图4所示，降压原理是通过不停的控制开关S1和开关S2的开通与关断，并结合储能电感L1提供稳定的降压之后的输出电压Vout1。其输出电压Vout1＝Vin*占空比，其中，Vin为输入的DC电压，占空比就是开关打开的时间与一个完整调制周期的比值。但是，在调整占空比的同时，随着开关电源的开关工作频率的变化，开关噪声频率也会变得不稳定，如何精确有效地滤除开关产生的噪声，从而稳定供电电压、改善系统性能是一个亟需解决的问题。
为了有效地滤除开关产生的噪声，从而稳定供电电压、改善系统性能，本申请实施例提供一种纹波电压处理装置。图5为本申请实施例中纹波电压处理装置的组成结构示意图，如图5所示，纹波电压处理装置10至少包括：第一控制器100、可调滤波器101、存储器102；其中，
存储器102，其中存储有频率信息与调节参数之间的对应关系；存储器102用于接收并存储来自开关电源20的当前开关工作频率信息；
第一控制器100，用于从存储器102中读取开关电源20的当前开关工作频率信息；查询存储器102中的对应关系，获得开关电源20的当前开关工作频率信息对应的调节参数；根据获得的调节参数对可调滤波器101进行控制；
可调滤波器101，用于按照第一控制器100的控制，将滤波频率调整为开关电源20的当前开关工作频率，以滤除开关电源20的输出电压中对应当前开关工作频率的开关噪声，即滤除开关电源20输出的第一输出电压V out1中开关工作频率上的噪声，得到第二输出电压V out2。
本申请实施例提供的纹波电压处理装置，根据开关电源对其开关工作频率的调整，针对开关电源的当前开关工作频率带来的开关噪声频率，自动调整滤波频率，实时对开关电源的输出电压进行滤波处理，有效地去除了电压纹波，保证了开关电源输出稳定的电压。
在一种示例性实例中，存储器102和第一控制器100可以分开设置即分别为独立的实体；存储器102和第一控制器100也可以合并设置即为同一实体，比如可以是一带存储单元的处理器，或者是一电源管理芯片(PMIC，Power  Management IC)等。
滤波器可以实现对电源线中特定频率的频点或该频点以外的频率进行有效滤除，得到一个特定频率的电源信号，或消除一个特定频率后的电源信号。本申请实施例中的可调滤波器101滤除的频率点是可以随着调节参数的变化而发生改变的滤波器，比如：可调滤波器101可以是通过施加在端子上的电压的变化来改变静电容量值的数控可变电容器(不是变容二极管)、数字可编程电容器、可调数字滤波器等。如图5所示，结合图3，在纹波电压处理装置所在系统开始工作之后，开关电源20的监测电路200根据负载情况，通过脉冲调制控制电路201产生控制开关电源内部开关电路202的第一开关工作频率，并将第一开关工作频率存储到存储器102中；第一控制器100从存储器102中读取第一开关工作频率，并查询存储器102中的对应关系，获得第一开关工作频率对应的第一调节参数；第一控制器100根据获得的第一调节参数对可调滤波器101进行控制；可调滤波器101则按照第一控制器100的控制，将滤波频率调整为第一开关工作频率，以滤除开关电源20输出的第一输出电压V out1中第一开关工作频率上的噪声，得到第二输出电压V out2。
当负载发生变化，开关电源20的监测电路200会检测到负载的变化，并通过脉冲调制控制电路201产生控制开关电源内部电路202的第二开关工作频率以满足负载需求，并将调整后的第二开关工作频率存储在存储器102中；在纹波电压处理装置的第一控制器100从存储器102中读取到发生变化的第二开关工作频率后，通过查询存储器102中的对应关系，获得第二开关工作频率对应的第二调节参数；第一控制器100根据获得的第二调节参数对可调滤波器101进行控制；可调滤波器101则按照第一控制器100的控制，将滤波频率调整为第二开关工作频率，以滤除开关电源20输出的第一输出电压V out1中第二开关工作频率上的噪声，得到第二输出电压V out2。
以此类推，每次只要负载发生变化导致开关电源20的开关工作频率发生变化，都会相应调整可调滤波器101的滤波频率，以滤除开关电源的输出电压中相应的开关产生的噪声。
在一种示例性实例中，本申请实施例提供的纹波电压处理装置可以作为以独立装置，如图6所示；也可以设置在开关电源中，如图7所示；还可以 设置在开关电源的负载中，如图8所示。
在一种示例性实例中，本申请实施例还提供一种开关电源，如图7所示，包括本申请任一项所述的纹波电压处理装置。本实施例中，开关电源20还包括：开关电路202、监测电路200、脉冲调制控制电路201、电容电感构成的电路203；其中，
监测电路200，用于监测电容电感构成的电路203的第一输出电压Vout1；
脉冲调制控制电路201，用于根据监测到的第一输出电压Vout1，通过脉冲调制控制方式产生开关工作频率，对开关电路的开通或关断进行控制；并将当前的开关工作频率存储到纹波电压处理装置的存储器102中；
开关电路202，用于在脉冲调制控制电路201的控制下，按照开关工作频率执行开通或关断动作，以维持电容电感构成的电路203的第一输出电压Vout1稳定；
电容电感构成的电路201，用于输出电压至纹波电压处理装置的可调滤波器101，以滤除开关噪声后输出稳定的第二输出电压Vout2。
下面以射频收发电路中供电系统应用本申请纹波电压处理装置为例，详细描述纹波电压处理装置的工作过程。如图9所示，为了保证射频性能，DC-DC开关电源20需要提供稳定的输出直流电压作为负载的功率放大器(PA)供电。本实施例中，以第一控制器100为PMIC、可调滤波器101为天线调谐器(Tuner)为例。Tuner101有带抽头的电感线圈和可变电容器构成，可以根据不同的电压值调节自身的电容值。
DC-DC开关电源10给PA供电，供电电源上会存在开关噪声，开关噪声会对射频信号噪声产生影响，经过PA放大之后会产生交调信号，从而导致射频性能指标变差。
开关噪声的频率与开关工作频率有关，在本申请实施例提供的纹波电压处理装置所在系统开始工作之后，DC-DC开关电源20中的监测电路200根据负载情况，通过DC-DC开关电源20中的脉冲调制控制电路201产生控制DC-DC开关电源20内部开关电路202的开关工作频率，并将当前的开关工作频率存储到存储器102中；在存储器102中预先存储有开关工作频率与 Tuner101的相关参数即调节参数，如表1所示，本实施例中开关工作频率与Tuner101的相关参数的值包括如下所示。
开关工作频率 Tuner101的相关参数的值
3MHz 0x01
2MHz 0x02
1MHz 0x03
表1
PMIC100可以通过如移动行业处理器接口(MIPI，Mobile Industry Processor Interface)，从存储器102中读取当前的开关工作频率，并查询存储器102中的对应关系，获得当前的开关工作频率对应的Tuner101的相关参数的值；PMIC100根据获得的Tuner101的相关参数的值，向Tuner101输出对应该Tuner101的相关参数的值的电压值，以对Tuner101进行控制。这里，以PMIC100中存储有如表2所示的Tuner101的相关参数的值与相应的电压值之间的对应关系为例。
Tuner101的相关参数的值 电压值
0x01 3V
0x02 2.8V
0x03 2.6V
表2
Tuner101根据PMIC100的控制电压的大小，调节出对应的电容值，Tuner101的控制电压与电容值的关系实例如表3所示，该电容值对应的自谐振频率为当前的开关工作频率的频点，从而实现了滤除DC-DC开关电源20输出的电压中的开关工作频率下的噪声。
控制电压的值 电容值
3V 100PF
2.8V 50PF
2.6V 30PF
表3
从本实施例可以看出，只要DC-DC开关电源20的负载发生变化导致 DC-DC开关电源20的开关工作频率发生变化，都会自动调整Tuner101的滤波频率，以滤除DC-DC开关电源20的输出电压中相应的开关产生的噪声。
图10为本申请实施例中纹波电压处理方法的流程示意图，应用于设置有本申请纹波电压处理装置的电子设备中，如图10所示，包括：
步骤100：纹波电压处理装置获取开关电源的当前开关工作频率信息。
在一种示例性实例中，步骤100之前还可以包括：接收开关电源的当前开关工作频率信息并存储。
开关电源的当前开关工作频率信息是开关电源根据自身负载情况产生的，用于控制开关电源中的开关开通或关闭的脉冲调制信号的工作频率信息。
步骤101：纹波电压处理装置根据获得的当前开关工作频率信息确定调节参数。
在一种示例性实例中，步骤101之前还可以包括：预先存储频率信息与调节参数之间的对应关系。相应地，步骤101可以包括：
查询预先存储频率信息与调节参数之间的对应关系，得到当前开关工作频率信息对应的调节参数。
步骤102：纹波电压处理装置按照确定的调节参数，将滤波频率调整为当前开关工作频率，以滤除开关电源的输出电压中对应当前开关工作频率的开关噪声。
本申请实施例提供的纹波电压处理方法，根据开关电源对其开关工作频率的调整，针对开关电源的当前开关工作频率带来的开关噪声频率，自动调整滤波频率，实时对开关电源的输出电压进行滤波处理，有效地去除了电压纹波，保证了开关电源输出稳定的电压。
虽然本申请所揭露的实施方式如上，但所述的内容仅为便于理解本申请而采用的实施方式，并非用以限定本申请。任何本申请所属领域内的技术人员，在不脱离本申请所揭露的精神和范围的前提下，可以在实施的形式及细节上进行任何的修改与变化，但本申请的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (11)

  1. 一种纹波电压处理装置，包括：第一控制器、可调滤波器、存储器；其中，
    所述存储器中存储有频率信息与调节参数之间的对应关系；所述存储器用于接收并存储来自开关电源的当前开关工作频率信息；
    所述第一控制器，用于从所述存储器中读取所述当前开关工作频率信息；查询所述对应关系，获得所述当前开关工作频率信息对应的调节参数；根据所述调节参数对所述可调滤波器进行控制；
    所述可调滤波器，用于按照所述第一控制器的控制，将滤波频率调整为所述当前开关工作频率，以滤除所述开关电源的输出电压中对应所述当前开关工作频率的开关噪声。
  2. 根据权利要求1所述的纹波电压处理装置，其中，所述可调滤波器为：数控可变电容器、或数字可编程电容器、或可调数字滤波器。
  3. 根据权利要求1所述的纹波电压处理装置，其中，所述存储器和所述第一控制器为独立实体，或为同一实体。
  4. 根据权利要求1所述的纹波电压处理装置，其中，所述第一控制器为处理器、或电源管理芯片。
  5. 根据权利要求1～4任一项所述的纹波电压处理装置，其中，所述纹波电压处理装置为一独立装置，或所述纹波电压处理装置设置在所述开关电源中，或所述纹波电压处理装置设置在所述开关电源的供电负载中。
  6. 根据权利要求1～4任一项所述的纹波电压处理装置，其中，所述开关电源为直流-直流开关电源，或交流-直流开关电源。
  7. 一种开关电源，包括权利要求1～4任一项所述的纹波电压处理装置。
  8. 根据权利要求7所述的开关电源，还包括：开关电路、监测电路、脉冲调制控制电路、电容电感构成的电路；其中，
    所述监测电路，用于监测所述电容电感构成的电路的第一输出电压；
    所述脉冲调制控制电路，用于根据监测到的所述第一输出电压，通过脉 冲调制控制方式产生开关工作频率，对所述开关电路的开通或关断进行控制；并将所述开关工作频率存储到所述纹波电压处理装置的存储器中；
    所述开关电路，用于在所述脉冲调制控制电路的控制下，按照所述开关工作频率执行开通或关断动作，以维持所述开关电源的输出电压值稳定；
    所述电容电感构成的电路，用于将所述第一输出电压输出至所述纹波电压处理装置的可调滤波器，以滤除开关噪声后输出稳定的第二输出电压。
  9. 根据权利要求8所述的开关电源，其中，所述脉冲调制控制方式包括：脉冲宽度调制方式、和/或脉冲频率调制方式。
  10. 根据权利要求7、8或9所述的开关电源，其中，所述开关电源为直流-直流开关电源，或交流-直流开关电源。
  11. 一种纹波电压处理方法，应用于设置有权利要求1～4任一项所述的纹波电压处理装置的电子设备中，包括：
    所述纹波电压处理装置获取开关电源的当前开关工作频率信息；
    所述纹波电压处理装置根据所述当前开关工作频率信息确定调节参数；所述纹波电压处理装置按照确定的所述调节参数，将滤波频率调整为所述当前开关工作频率，以滤除所述开关电源的输出电压中对应所述当前开关工作频率的开关噪声。
PCT/CN2022/140153 2022-02-07 2022-12-19 纹波电压处理装置及方法和开关电源 WO2023147745A1 (zh)

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