CN116566175B - Voltage sampling circuit, switching power supply and chip - Google Patents
Voltage sampling circuit, switching power supply and chip Download PDFInfo
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- CN116566175B CN116566175B CN202310827390.9A CN202310827390A CN116566175B CN 116566175 B CN116566175 B CN 116566175B CN 202310827390 A CN202310827390 A CN 202310827390A CN 116566175 B CN116566175 B CN 116566175B
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- 238000005070 sampling Methods 0.000 title claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 102100031172 C-C chemokine receptor type 1 Human genes 0.000 description 1
- 101710149814 C-C chemokine receptor type 1 Proteins 0.000 description 1
- 102100031151 C-C chemokine receptor type 2 Human genes 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the application provides a voltage sampling circuit, a switching power supply and a chip. The voltage sampling circuit comprises: the input end of the voltage acquisition module is electrically connected with the tested power supply and is used for acquiring a first voltage signal; the first input end of the voltage conversion module is electrically connected with the output end of the voltage acquisition module and is used for converting the first voltage signal into a second voltage signal according to a feedback voltage signal; the input end of the control module is electrically connected with the output end of the voltage conversion module, and the output end of the control module is electrically connected with the second input end of the voltage conversion module and is used for updating the feedback voltage signal output to the voltage conversion module according to the second voltage signal. According to the embodiment of the application, the dynamic response speed of the switching power supply can be improved.
Description
Technical Field
The embodiment of the application relates to the technical field of power electronics, in particular to a voltage sampling circuit, a switching power supply and a chip.
Background
In the field of power electronics, a switching power supply is often used for power conversion, for example, to convert ac power into dc voltage required by a user terminal.
In the related art, the switching power supply needs to adjust the on duty ratio of the driving tube according to the magnitude of the actual output voltage. However, in this control mode, the dynamic response speed of the switching power supply is slow, and the control accuracy is low.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a voltage sampling circuit, a switching power supply, and a chip, which can improve the dynamic response speed and control accuracy of the switching power supply.
In a first aspect of an embodiment of the present application, there is provided a voltage sampling circuit including:
the input end of the voltage acquisition module is electrically connected with the tested power supply and is used for acquiring a first voltage signal;
the first input end of the voltage conversion module is electrically connected with the output end of the voltage acquisition module and is used for converting the first voltage signal into a second voltage signal according to the feedback voltage signal;
the input end of the control module is electrically connected with the output end of the voltage conversion module, and the output end of the control module is electrically connected with the second input end of the voltage conversion module and is used for updating the feedback voltage signal output to the voltage conversion module according to the second voltage signal.
In this embodiment, the voltage acquisition module acquires the first voltage signal of the tested power supply, the voltage conversion module converts the first voltage signal according to the feedback voltage signal to obtain the second voltage signal, and the control module updates the output feedback voltage signal according to the second voltage signal, so that the pulse width of the feedback voltage signal output by the control module is dynamically adjusted, and the pulse width of the second voltage signal is dynamically adjusted, so that the dynamic response speed and the control precision of the switching power supply are improved.
In an alternative manner, the voltage acquisition module is specifically configured to: collecting a voltage signal output by a tested power supply as a first voltage signal; wherein the first voltage signal is a direct current voltage signal.
In this embodiment, the voltage signal output by the tested power supply is converted into the direct-current voltage signal by the voltage acquisition module, so that dynamic control on the output voltage signal of the power supply can be realized.
In an alternative way, the voltage conversion module is specifically configured to: and comparing the feedback voltage signal with the first voltage signal to obtain a second voltage signal.
In this embodiment, the feedback voltage signal is compared with the first voltage signal to convert the first voltage signal into the second voltage signal, so that the pulse width of the second voltage signal can be adjusted according to the pulse width of the feedback voltage signal, dynamic adjustment of the pulse width is achieved, and further, the dynamic response speed and control accuracy of the switching power supply can be improved.
In an alternative, the feedback voltage signal is a ramp signal and the second voltage signal is a pulse width modulated (Pulse Width Modulation, PWM) signal.
In an alternative way, the control module comprises a capturing unit and an output unit;
the input end of the capturing unit is used as the input end of the control module and is electrically connected with the output end of the voltage conversion module, the output end of the capturing unit is electrically connected with the input end of the output unit, and the output end of the output unit is used as the output end of the control module and is electrically connected with the second input end of the voltage conversion module;
the capturing unit is used for acquiring the pulse width of the second voltage signal; the output unit is used for updating the pulse width of the feedback voltage signal according to the pulse width and outputting the updated feedback voltage signal to the voltage conversion module.
In this embodiment, the capturing unit may obtain the pulse width, and adjust the pulse width of the feedback voltage signal according to the pulse width, so that the voltage conversion module may adjust the pulse width of the second voltage signal according to the feedback voltage signal, thereby implementing dynamic adjustment of the pulse width, and improving the dynamic response speed and control accuracy of the switching power supply.
In an alternative, the control module is a micro control unit (Micro Controllor unit, MCU).
In a second aspect of the embodiment of the present application, there is also provided a switching power supply, including: the voltage sampling circuit according to any one of the first aspects of the embodiments of the present application.
A third aspect of the embodiments of the present application further provides a chip including a voltage sampling circuit according to any one of the first aspect of the embodiments of the present application.
The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present application can be more clearly understood, and the following specific embodiments of the present application are given for clarity and understanding.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of a voltage sampling circuit provided by an embodiment of the present application;
fig. 2 is a schematic diagram of a voltage signal in a voltage sampling circuit according to an embodiment of the present application;
FIG. 3 shows a schematic diagram of a voltage sampling circuit provided by an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a measurement principle of a capturing unit in the voltage sampling circuit according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
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 in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the description of the drawings are intended to cover a non-exclusive inclusion.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Furthermore, the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to improve one or more of these features either explicitly or implicitly.
In the description of the present application, unless otherwise indicated, the meaning of "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two).
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as a "connected" or "coupled" of a mechanical structure may refer to a physical connection, e.g., as a fixed connection, e.g., via a fastener, such as a screw, bolt, or other fastener; the physical connection may also be a detachable connection, such as a snap-fit or snap-fit connection; the physical connection may also be an integral connection, such as a welded, glued or integrally formed connection. "connected" or "connected" of circuit structures may refer to physical connection, electrical connection or signal connection, for example, direct connection, i.e. physical connection, or indirect connection through at least one element in the middle, so long as circuit communication is achieved, or internal communication between two elements; signal connection may refer to signal connection through a medium such as radio waves, in addition to signal connection through a circuit. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In order to make the person skilled in the art better understand the solution of the present application, the technical solution of the embodiment of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a voltage sampling circuit according to an embodiment of the present application. As shown in fig. 1, the voltage sampling circuit of the present application may include: the device comprises a voltage acquisition module 1100, a voltage conversion module 1200 and a control module 1300.
The input end of the voltage acquisition module 1100 is electrically connected with the tested power supply 1400, the output end of the voltage acquisition module 1100 is electrically connected with the first input end of the voltage conversion module 1200, the output end of the voltage conversion module 1200 is electrically connected with the input end of the control module 1300, and the output end of the control module 1300 is electrically connected with the second input end of the voltage conversion module 1200.
The voltage acquisition module 1100 is configured to acquire a first voltage signal. The voltage conversion module 1200 is configured to convert the first voltage signal into the second voltage signal according to the feedback voltage signal. The control module 1300 is configured to update the feedback voltage signal output to the voltage conversion module 1200 according to the second voltage signal.
Specifically, the power source 1400 to be measured may be an ac power source or a dc power source. In the case where the power source 1400 is an ac power source, the voltage signal collected by the voltage collection module 1100 is an ac voltage signal. In the case where the power source 1400 is a dc power source, the voltage signal collected by the voltage collection module 1100 is a dc voltage signal.
The voltage acquisition module 1100 is configured to acquire a voltage signal output by the tested power supply 1400 as a first voltage signal; wherein the first voltage signal is a direct current voltage signal. In this way, the voltage acquisition module 1100 converts the voltage signal output by the tested power supply 1400 into a direct current voltage signal, so as to realize dynamic control on the output voltage signal of the power supply.
The voltage acquisition module 1100 acquires the voltage signal output by the tested power supply 1400 as a first voltage signal, and then outputs the first voltage signal to the voltage conversion module 1200, and the voltage conversion module 1200 compares the feedback voltage signal with the first voltage signal to obtain a second voltage signal. The feedback voltage signal is a ramp signal, and the second voltage signal is a pulse width modulation (Pulse Width Modulation, PWM) signal.
Fig. 2 shows a schematic diagram of a voltage signal in a voltage sampling circuit according to an embodiment of the present application. Specifically, as shown in fig. 2, the voltage conversion module 1200 may compare the feedback voltage signal with the dc voltage signal from the voltage acquisition module 1100 to obtain the second voltage signal.
Specifically, when the intersection point of the feedback voltage signal and the direct current voltage signal is at a rising edge, the recording voltage is turned over once, and when the intersection point of the feedback voltage signal and the direct current voltage signal is at a falling edge, the recording voltage is turned over once, so that the first voltage signal is converted into the second voltage signal.
It can be seen that the pulse width of the second voltage signal is related to the pulse width of the feedback voltage signal. The wider the pulse width of the feedback voltage signal, the correspondingly wider the pulse width of the second voltage signal. Similarly, the smaller the pulse width of the feedback voltage signal, the smaller the pulse width of the second voltage signal.
Therefore, the voltage conversion module 1200 can adjust the pulse width of the second voltage signal according to the pulse width of the feedback voltage signal, so as to dynamically adjust the pulse width of the second voltage signal.
In this embodiment, the voltage acquisition module 1100 acquires the first voltage signal of the tested power supply 1400, the voltage conversion module 1200 converts the first voltage signal according to the feedback voltage signal to obtain the second voltage signal, and the control module 1300 updates the output feedback voltage signal according to the second voltage signal, so that the pulse width of the second voltage signal is dynamically adjusted by dynamically adjusting the pulse width of the feedback voltage signal output by the control module 1300, and further, the dynamic response speed and control precision of the switching power supply are improved.
Fig. 3 shows a schematic diagram of a voltage sampling circuit according to an embodiment of the present application. As shown in fig. 3, in the present embodiment, the control module 1300 may include a capturing unit 1310 and an output unit 1320, based on the above embodiment.
The input end of the capturing unit 1310 is electrically connected to the output end of the voltage conversion module 1200 as the input end of the control module 1300, the output end of the capturing unit 1310 is electrically connected to the input end of the output unit 1320, and the output end of the output unit 1320 is electrically connected to the second input end of the voltage conversion module 1200 as the output end of the control module 1300.
The capturing unit 1310 is configured to obtain a pulse width of the second voltage signal; the output unit 1320 is configured to update the pulse width of the feedback voltage signal according to the pulse width, and output the updated feedback voltage signal to the voltage conversion module 1200.
Specifically, the capturing unit 1310 may store the current timer value into the capturing/comparing register of the corresponding channel when the second voltage signal jumps, so as to complete capturing once.
Fig. 4 is a schematic diagram illustrating a measurement principle of a capturing unit 1310 in a voltage sampling circuit according to an embodiment of the present application. As shown in FIG. 4, assuming the timer is operating in the count-up mode, time t 1-t 2 in FIG. 4 is the high level time that needs to be measured.
Specifically, the timer channel is first set to capture a rising edge, so that at time t1, capture unit 1310 may capture a current count value (CNT), denoted as CCR1, then immediately clear the count value, and set the timer channel to capture a falling edge, so that at time t2, a capture event occurs again, capture unit 1310 captures the current count value, denoted as CCR2. Thus, according to the technical frequency of the timer, the time t 1-t 2 can be calculated, and the high-level pulse width can be obtained. The pulse width of the second voltage signal can be measured by sequentially cycling.
After updating the pulse width of the feedback voltage signal, the output unit 1320 outputs the updated feedback voltage signal to the voltage conversion module 1200, so that the voltage conversion module 1200 converts the first voltage signal according to the updated feedback voltage signal to obtain a new second voltage signal, thereby dynamically adjusting the pulse width of the feedback voltage signal output by the dynamic adjustment control module 1300.
The control unit may be a micro control unit (Micro Controllor unit, MCU) for example. The present application does not specifically limit the specific model of the control unit.
In this embodiment, the capturing unit 1310 obtains the pulse width, and adjusts the pulse width of the feedback voltage signal according to the pulse width, so that the voltage conversion module 1200 can adjust the pulse width of the second voltage signal according to the feedback voltage signal, thereby implementing dynamic adjustment of the pulse width of the second voltage signal, and improving the dynamic response speed and control accuracy of the switching power supply.
In some embodiments, the present application further provides a switching power supply including the voltage sampling circuit according to the above embodiments of the present application.
The working principle of the voltage sampling circuit in this embodiment may refer to the related description in the foregoing embodiment, and will not be described herein.
The switching power supply of the embodiment can improve the dynamic response speed and control precision of the switching power supply by applying the voltage sampling circuit.
In some embodiments, the present application further provides a chip including the voltage sampling circuit in the embodiments of fig. 1 to 4.
The working principle of the voltage sampling circuit in this embodiment may refer to the related description in the foregoing embodiment, and will not be described herein.
The chip of the embodiment can improve the dynamic response speed and the control precision by applying the voltage sampling circuit.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of first, second, third, etc. does not denote any order, and the words are to be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. A voltage sampling circuit, comprising:
the input end of the voltage acquisition module is electrically connected with the tested power supply and is used for acquiring a first voltage signal;
the first input end of the voltage conversion module is electrically connected with the output end of the voltage acquisition module and is used for converting the first voltage signal into a second voltage signal according to a feedback voltage signal;
the input end of the control module is electrically connected with the output end of the voltage conversion module, and the output end of the control module is electrically connected with the second input end of the voltage conversion module and is used for updating the feedback voltage signal output to the voltage conversion module according to the second voltage signal;
the control module comprises a capturing unit and an output unit;
the input end of the capturing unit is used as the input end of the control module and is electrically connected with the output end of the voltage conversion module, the output end of the capturing unit is electrically connected with the input end of the output unit, and the output end of the output unit is used as the output end of the control module and is electrically connected with the second input end of the voltage conversion module;
the capturing unit is used for acquiring the pulse width of the second voltage signal; the output unit is used for updating the pulse width of the feedback voltage signal according to the pulse width and outputting the updated feedback voltage signal to the voltage conversion module.
2. The voltage sampling circuit of claim 1, wherein the voltage acquisition module is specifically configured to: collecting a voltage signal output by the tested power supply as the first voltage signal; wherein the first voltage signal is a direct current voltage signal.
3. The voltage sampling circuit of claim 2, wherein the voltage conversion module is specifically configured to: and comparing the feedback voltage signal with the first voltage signal to obtain the second voltage signal.
4. A voltage sampling circuit according to claim 3 wherein the feedback voltage signal is a ramp signal and the second voltage signal is a pulse width modulated PWM signal.
5. The voltage sampling circuit of any one of claims 1 to 4, wherein the control module is a micro control unit MCU.
6. A switching power supply, comprising: a voltage sampling circuit according to any one of claims 1 to 5.
7. A chip comprising a voltage sampling circuit according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310827390.9A CN116566175B (en) | 2023-07-07 | 2023-07-07 | Voltage sampling circuit, switching power supply and chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310827390.9A CN116566175B (en) | 2023-07-07 | 2023-07-07 | Voltage sampling circuit, switching power supply and chip |
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| Publication Number | Publication Date |
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| CN116566175A CN116566175A (en) | 2023-08-08 |
| CN116566175B true CN116566175B (en) | 2023-09-22 |
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| CN104779796A (en) * | 2015-03-30 | 2015-07-15 | 陆俊 | Power supply output voltage adjusting circuit and device |
| CN208479472U (en) * | 2017-04-19 | 2019-02-05 | 嘉兴山蒲照明电器有限公司 | A kind of switch converters and emergency ballast |
| CN109936290A (en) * | 2019-04-29 | 2019-06-25 | 深圳市力生美半导体股份有限公司 | Switching power circuit |
| CN111404390A (en) * | 2020-04-20 | 2020-07-10 | 珠海格力电器股份有限公司 | Magnetic isolation feedback device and method of switching power supply and switching power supply |
| CN217469739U (en) * | 2022-05-24 | 2022-09-20 | 深圳欣锐科技股份有限公司 | Feedback circuit, switching power supply, and electronic device |
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2023
- 2023-07-07 CN CN202310827390.9A patent/CN116566175B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779796A (en) * | 2015-03-30 | 2015-07-15 | 陆俊 | Power supply output voltage adjusting circuit and device |
| CN208479472U (en) * | 2017-04-19 | 2019-02-05 | 嘉兴山蒲照明电器有限公司 | A kind of switch converters and emergency ballast |
| CN109936290A (en) * | 2019-04-29 | 2019-06-25 | 深圳市力生美半导体股份有限公司 | Switching power circuit |
| CN111404390A (en) * | 2020-04-20 | 2020-07-10 | 珠海格力电器股份有限公司 | Magnetic isolation feedback device and method of switching power supply and switching power supply |
| CN217469739U (en) * | 2022-05-24 | 2022-09-20 | 深圳欣锐科技股份有限公司 | Feedback circuit, switching power supply, and electronic device |
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| CN116566175A (en) | 2023-08-08 |
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