CN114430227B - Ripple voltage processing device and method, and switching power supply - Google Patents
Ripple voltage processing device and method, and switching power supply Download PDFInfo
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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
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- 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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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。
The application discloses a ripple voltage processing device and method and a switching power supply. According to the adjustment of the switching frequency of the switching power supply, the embodiment of the application automatically adjusts the filtering frequency for the switching noise frequency caused by the current switching frequency of the switching power supply. Frequency, real-time filter processing of the output voltage of the switching power supply, effectively removes the voltage ripple, and ensures a stable output voltage of the switching power supply.
Description
Technical Field
The present disclosure relates to, but not limited to, electronic technology, and more particularly, to a ripple voltage processing apparatus and method and a switching power supply.
Background
The switching power supply is short for switching regulated power supply. Since the switching action (switching frequency) of the switching power supply causes fluctuations in the output dc voltage, such fluctuations may be referred to as switching noise. Switching noise can cause the switching power supply to output a ripple voltage, which is a noise harmful to the circuit and can cause the voltage supplied to the load by the switching power supply to be unstable.
Disclosure of Invention
The application provides a ripple voltage processing device and method and a switching power supply, which can effectively remove voltage ripples and ensure that the switching power supply outputs stable voltage.
The embodiment of the application provides a ripple voltage processing device, which comprises: the first controller, the adjustable filter and the memory; wherein,,
the memory stores the corresponding relation between the frequency information and the adjusting parameter; the memory is used for receiving and storing the current switching frequency information from the switching power supply;
the first controller is used for reading the current switching frequency information from the memory; inquiring the corresponding relation to obtain an adjusting parameter corresponding to the current switching frequency information; controlling the adjustable filter according to the adjustment parameters;
the adjustable filter is used for adjusting the filtering frequency to the current switching working frequency according to the control of the first controller so as to filter switching noise corresponding to the current switching working frequency in the output voltage of the switching power supply; the adjustable filter is an antenna tuner in a radio frequency receiving and transmitting circuit.
The embodiment of the application provides a switching power supply, which comprises any one of the ripple voltage processing devices provided by the embodiment of the application.
An embodiment of the present application further provides a ripple voltage processing method, which is applied to an electronic device provided with the ripple voltage processing apparatus of any one of claims 1 to 4, and includes:
a memory in the ripple voltage processing device acquires current switching frequency information of the switching power supply;
a first controller in the ripple voltage processing device determines an adjusting parameter according to the current switching frequency information;
a first controller in the ripple voltage processing device controls an adjustable filter in the ripple voltage processing device according to the determined adjusting parameter, and adjusts the filtering frequency to the current switching frequency so as to filter switching noise corresponding to the current switching frequency in the output voltage of the switching power supply; the adjustable filter is an antenna tuner in a radio frequency receiving and transmitting circuit.
According to the embodiment of the application, according to the adjustment of the switching power supply to the switching working frequency of the switching power supply, the filtering frequency is automatically adjusted according to the switching noise frequency brought by the current switching working frequency of the switching power supply, the output voltage of the switching power supply is filtered in real time, the voltage ripple is effectively removed, and the stable voltage output by the switching power supply is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.
FIG. 1 is a schematic waveform diagram of an embodiment of a PWM control scheme;
FIG. 2 is a schematic waveform diagram of an embodiment of a PFM control scheme;
FIG. 3 is a schematic diagram of a switching power supply;
FIG. 4 is a schematic diagram of a circuit configuration of a buck switching power supply;
FIG. 5 is a schematic diagram of the structure of a ripple voltage processing device according to an embodiment of the present application;
fig. 6 is a schematic diagram of an application scenario embodiment of a ripple voltage processing apparatus according to an embodiment of the present application;
fig. 7 is a schematic diagram of an application scenario embodiment two of a ripple voltage processing apparatus in the embodiment of the present application;
fig. 8 is a schematic diagram of an application scenario embodiment three of a ripple voltage processing apparatus in the embodiment of the present application;
fig. 9 is a schematic diagram of an application scenario embodiment four of a ripple voltage processing apparatus in the embodiment of the present application;
fig. 10 is a flow chart of a ripple voltage processing method in an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It is to be understood that the terms "first," "second," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
A switching power supply is a power supply that maintains a stable output voltage by controlling the time ratio (and duty cycle) at which a switching transistor is turned on and off using modern power electronics. 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.
For a switching power supply, if it is desired to maintain an output voltage unchanged in the event of a load change, there is generally a feedback system for monitoring the output voltage and controlling a time ratio of turning on and off switching transistors in the switching power supply in a control manner such as Pulse-Width Modulation (PWM), pulse frequency Modulation (PFM, pulse Frequency Modulation) according to the monitored output voltage, thereby maintaining an output voltage value of the switching power supply unchanged. Taking a PWM control manner as an example, in a case where the modulation period is constant, if it is monitored that the output voltage of the switching power supply becomes low, meaning that the load becomes heavy, the duty ratio of the pulse modulation signal may be increased, that is, as shown in fig. 1, the output voltage value of the switching power supply may be maintained unchanged by increasing the time proportion in which the switch is turned on in the switching power supply; if the output voltage of the switching power supply becomes high, meaning that the load becomes light, the duty ratio of the pulse modulation signal may be reduced, that is, as shown in fig. 1, the output voltage value of the switching power supply may be maintained unchanged by reducing the proportion of time that the switch is on. Taking a PFM control manner as an example, if the output voltage of the switching power supply is monitored to be low under the condition that the switching on duration is fixed, which means that the load becomes heavy, the number of switching on times of the switch can be increased through the pulse modulation signal, as shown in fig. 2, that is, the frequency of the pulse modulation signal becomes high; if it is detected that the output voltage of the switching power supply becomes high, meaning that the load becomes light, the number of times the switch is turned on can be reduced by the pulse modulation signal, as shown in fig. 2, that is, the frequency of the pulse modulation signal becomes low.
Taking a DC-DC switching power supply as an example, it is generally composed of a switching controller chip such as a pulse modulation control circuit, a MOSFET switch, an inductor, a capacitor, and the like. Fig. 3 is a schematic diagram of a switching power supply, and as shown in fig. 3, 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 capacitance and inductance; wherein,,
a monitoring circuit 200 for monitoring the output voltage of the switching power supply 20;
the pulse modulation control circuit 201 is configured to generate a switching frequency according to the monitored output voltage by a pulse modulation control manner, and control on or off of the switching circuit 202;
a switching circuit 202 for performing an on or off operation according to the switching frequency under the control of the pulse modulation control circuit 201 to maintain the output voltage value of the switching power supply 20 stable;
and a circuit formed by the capacitor and the inductor is used for outputting stable output voltage.
Fig. 4 is a schematic diagram of a circuit configuration of a buck (buck) switching power supply, and fig. 4 shows a scenario in which a DC power supply supplies power to a load RL. As shown in fig. 3 and 4, the monitoring circuit 200 and the pulse modulation control circuit 201 are combined to form a feedback system for monitoring the output voltage Vout1, and controlling the on/off time ratio of the switching circuit 202 in the switching power supply, i.e. the control duty ratio, according to the monitored output voltage Vout1 by adopting a control mode such as PWM, PFM, etc., so as to maintain the output voltage value of the switching power supply unchanged. As shown in fig. 4, the voltage step-down principle is to continuously control the on and off of the switch S1 and the switch S2, and provide a stable output voltage Vout1 after step-down in combination with the energy storage inductor L1. The output voltage Vout 1=vin is the duty cycle, where Vin is the input DC voltage, and the duty cycle is the ratio of the time the switch is open to one complete modulation cycle. However, when the duty ratio is adjusted, the switching noise frequency becomes unstable along with the change of the switching operation frequency of the switching power supply, and how to accurately and effectively filter the noise generated by the switch, so that the problem of stabilizing the supply voltage and improving the system performance is needed to be solved.
In order to effectively filter noise generated by a switch, thereby stabilizing a power supply voltage and improving system performance, the embodiment of the application provides a ripple voltage processing device. Fig. 5 is a schematic structural diagram of a ripple voltage processing apparatus according to an embodiment of the present application, and as shown in fig. 5, the ripple voltage processing apparatus 10 at least includes: a first controller 100, a tunable filter 101, and a memory 102; wherein,,
a memory 102 in which a correspondence between frequency information and adjustment parameters is stored; the memory 102 is used for receiving and storing current switching frequency information from the switching power supply 20;
a first controller 100 for reading current switching operation frequency information of the switching power supply 20 from a memory 102; inquiring the corresponding relation in the memory 102 to obtain the adjusting parameter corresponding to the current switching frequency information of the switching power supply 20; controlling the tunable filter 101 according to the obtained tuning parameters;
the adjustable filter 101 is configured to adjust the filtering frequency to a current switching operation frequency of the switching power supply 20 according to the control of the first controller 100, so as to filter out switching noise corresponding to the current switching operation frequency in the output voltage of the switching power supply 20, that is, filter out the first output voltage V output by the switching power supply 20 out1 Noise on the working frequency of the medium switch to obtain a second output voltage V out2 。
According to the ripple voltage processing device provided by the embodiment of the application, according to the adjustment of the switching power supply to the switching working frequency of the switching power supply, the filtering frequency is automatically adjusted according to the switching noise frequency brought by the current switching working frequency of the switching power supply, the output voltage of the switching power supply is subjected to filtering processing in real time, the voltage ripple is effectively removed, and the stable output voltage of the switching power supply is ensured.
In an exemplary embodiment, the memory 102 and the first controller 100 may be separately configured, i.e., separate entities, or may be configured in a combined manner, i.e., the same entity, e.g., a processor with a memory unit, or a power management chip (PMIC, power Management IC), etc.
The filter can effectively filter the frequency points of the specific frequency or the frequencies outside the frequency points in the power line to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency. The frequency points filtered by the tunable filter 101 in the embodiment of the present application are filters that can be changed along with the change of the tuning parameters, for example: digitally controlled variable capacitors (not varactors), digitally programmable capacitors, tunable digital filters, etc., that can vary the value of the electrostatic capacitance by a change in the voltage applied across the terminals. As shown in fig. 5, in conjunction with fig. 3, after the system where the ripple voltage processing apparatus is located starts to operate, the monitoring circuit 200 of the switching power supply 20 generates a first switching operation frequency for controlling the internal switching circuit 202 of the switching power supply through the pulse modulation control circuit 201 according to the load condition, and stores the first switching operation frequency in the memory 102; the first controller 100 reads the first switching frequency from the memory 102, and inquires the corresponding relation in the memory 102 to obtain a first adjustment parameter corresponding to the first switching frequency; the first controller 100 controls the tunable filter 101 according to the obtained first tuning parameter; the adjustable filter 101 adjusts the filtering frequency to the first switching frequency according to the control of the first controller 100 to filter the first output voltage V outputted by the switching power supply 20 out1 Noise on the first switching frequency of the circuit to obtain a second output voltage V out2 。
When the load changes, the monitoring circuit 200 of the switching power supply 20 detects the change of the load, and generates a second switching frequency for controlling the internal circuit 202 of the switching power supply to meet the load requirement through the pulse modulation control circuit 201, and stores the adjusted second switching frequency in the memory 102; after the first controller 100 of the ripple voltage processing device reads the changed second switching operation frequency from the memory 102, obtaining a second adjustment parameter corresponding to the second switching operation frequency by querying a corresponding relation in the memory 102; the first controller 100 controls the tunable filter 101 according to the obtained second tuning parameter; the adjustable filter 101 adjusts the filtering frequency to the second switching frequency according to the control of the first controller 100 to filter the first output voltage V outputted by the switching power supply 20 out1 Noise on the second switching frequency of the circuit to obtain a second output voltage V out2 。
And so on, each time the switching operating frequency of the switching power supply 20 is changed due to the change of the load, the filtering frequency of the adjustable filter 101 is correspondingly adjusted to filter the noise generated by the corresponding switch in the output voltage of the switching power supply.
In one illustrative example, the ripple voltage handling apparatus of the present application may be provided as a stand-alone apparatus, as shown in fig. 6; may also be provided in a switching power supply, as shown in fig. 7; but may also be provided in the load of the switching power supply as shown in fig. 8.
In an exemplary embodiment, the embodiment of the present application further provides a switching power supply, as shown in fig. 7, including a ripple voltage processing apparatus according to any one of the present application.
The following describes in detail the working procedure of the ripple voltage processing device by taking the example that the power supply system in the radio frequency transceiver circuit applies the ripple voltage processing device. As shown in fig. 9, in order to secure radio frequency performance, the DC-DC switching power supply 20 needs to supply a stable output direct current voltage to a Power Amplifier (PA) as a load. In this embodiment, the first control unit is exemplified by PMIC, and the tunable filter 101 is exemplified by an antenna Tuner (Tuner). Tuner101 is formed with a tapped inductor and a variable capacitor, and can adjust its capacitance value according to different voltage values.
The DC-DC switching power supply 10 supplies power to the PA, and switching noise is present on the power supply, and affects the radio frequency signal noise, and after the PA amplifies, intermodulation signals are generated, thereby resulting in degradation of radio frequency performance indexes.
The frequency of the switching noise is related to the switching operating frequency, after the system where the ripple voltage processing apparatus provided in the embodiment of the present application starts to operate, the monitoring circuit 200 of the DC-DC switching power supply 20 generates the switching operating frequency for controlling the switching circuit 202 inside the switching power supply through the pulse modulation control circuit 201 of the DC-DC switching power supply 20 according to the load condition, and stores the current switching operating frequency into the memory 102; the memory 102 stores the relevant parameters of the switching frequency and the Tuner101, that is, the adjustment parameters, as shown in table 1, and the values of the relevant parameters of the switching frequency and the Tuner101 in this embodiment include the following.
| Switching frequency of operation | Values of relevant parameters of Tuner101 |
| 3MHz | 0x01 |
| 2MHz | 0x02 |
| 1MHz | 0x03 |
TABLE 1
The PMIC100 may read the current switching operation frequency from the memory 102 through, for example, an MIPI interface, and query the correspondence in the memory 102 to obtain the value of the relevant parameter of the Tuner101 corresponding to the current switching operation frequency.
The PMIC100 outputs a voltage value corresponding to the value of the relevant parameter of the Tuner101 to the Tuner101 according to the obtained value of the relevant parameter of the Tuner101 to control the Tuner 101. Here, the PMIC100 stores therein a correspondence relationship between the value of the relevant parameter of the Tuner101 and the corresponding voltage value as shown in table 2.
| Values of relevant parameters of Tuner101 | Voltage value |
| 0x01 | 3V |
| 0x02 | 2.8V |
| 0x03 | 2.6V |
TABLE 2
The corresponding capacitance value is adjusted by the Tuner101 according to the magnitude of the control voltage of the PMIC100, and the relationship between the control voltage of the Tuner101 and the capacitance value is shown in table 3, where the self-resonant frequency corresponding to the capacitance value is the frequency point of the current switching operation frequency, so as to filter noise under the switching operation frequency in the voltage output by the DC-DC switching power supply 20.
| Value of control voltage | Capacitance value |
| 3V | 100PF |
| 2.8V | 50PF |
| 2.6V | 30PF |
TABLE 3 Table 3
As can be seen from the present embodiment, as long as the load of the DC-DC switching power supply 20 changes to cause the switching operation frequency of the DC-DC switching power supply 20 to change, the filtering frequency of the Tuner101 is automatically adjusted to filter noise generated by the corresponding switch in the output voltage of the DC-DC switching power supply 20.
Fig. 10 is a schematic flow chart of a ripple voltage processing method in an embodiment of the present application, which is applied to an electronic device provided with a ripple voltage processing apparatus of the present application, as shown in fig. 10, and includes:
step 100: a memory in the ripple voltage processing device acquires current switching frequency information of the switching power supply.
In an illustrative example, step 100 may further include: and receiving and storing the current switching operating frequency information of the switching power supply.
The current switching frequency information of the switching power supply is generated by the switching power supply according to the self-load condition and is used for controlling the working frequency information of a pulse modulation signal for switching on or off a switch in the switching power supply.
Step 101: a first controller in the ripple voltage processing device determines the adjustment parameter according to the obtained current switching operation frequency information.
In an illustrative example, step 101 may further include: the correspondence between the frequency information and the adjustment parameters is stored in advance. Accordingly, step 101 may include:
inquiring the corresponding relation between the pre-stored frequency information and the adjusting parameter to obtain the adjusting parameter corresponding to the current switch working frequency information.
Step 102: the first controller in the ripple voltage processing device controls the adjustable filter in the ripple voltage processing device according to the determined adjusting parameter, and adjusts the filtering frequency to the current switching frequency so as to filter switching noise corresponding to the current switching frequency in the output voltage of the switching power supply.
According to the ripple voltage processing method provided by the embodiment of the application, according to the adjustment of the switching power supply to the switching working frequency of the switching power supply, the filtering frequency is automatically adjusted according to the switching noise frequency brought by the current switching working frequency of the switching power supply, the output voltage of the switching power supply is filtered in real time, the voltage ripple is effectively removed, and the stable voltage output by the switching power supply is ensured.
Although the embodiments disclosed in the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which this application pertains will be able to make any modifications and variations in form and detail of implementation without departing from the spirit and scope of the disclosure, but the scope of the application is still subject to the scope of the claims appended hereto.
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| CN202210120387.9A CN114430227B (en) | 2022-02-07 | 2022-02-07 | Ripple voltage processing device and method, and switching power supply |
| PCT/CN2022/140153 WO2023147745A1 (en) | 2022-02-07 | 2022-12-19 | Ripple voltage processing device and method, and switching power supply |
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| CN202210120387.9A CN114430227B (en) | 2022-02-07 | 2022-02-07 | Ripple voltage processing device and method, and switching power supply |
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2022
- 2022-02-07 CN CN202210120387.9A patent/CN114430227B/en not_active Expired - Fee Related
- 2022-12-19 WO PCT/CN2022/140153 patent/WO2023147745A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104272589A (en) * | 2012-04-30 | 2015-01-07 | 梅鲁斯音频有限公司 | Class D audio amplifier with adjustable loop filter characteristics |
| CN110445358A (en) * | 2019-08-21 | 2019-11-12 | 苏州智汇云祥通信系统有限公司 | A kind of system and method reducing power supply ripple |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023147745A9 (en) | 2023-09-21 |
| CN114430227A (en) | 2022-05-03 |
| WO2023147745A1 (en) | 2023-08-10 |
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