CN117096834B - Switching power supply and protection method thereof - Google Patents

Switching power supply and protection method thereof Download PDF

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Publication number
CN117096834B
CN117096834B CN202311348222.8A CN202311348222A CN117096834B CN 117096834 B CN117096834 B CN 117096834B CN 202311348222 A CN202311348222 A CN 202311348222A CN 117096834 B CN117096834 B CN 117096834B
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Prior art keywords
input
output
module
power supply
signal
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CN117096834A (en
Inventor
周勇
邹小安
张峰
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Lii Semiconductor Inc
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Lii Semiconductor Inc
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • 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)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses a switching power supply and a protection method thereof, and belongs to the technical field of power electronics. The switching power supply includes: the filtering module is used for filtering electromagnetic interference in the input alternating current; the input end of the power adjusting module is connected with the output end of the filtering module and is used for carrying out power adjustment on the input signal so as to generate an output signal suitable for load use; the input end of the input detection module is connected with the input end of the power adjustment module and is used for detecting an input signal to generate an input detection signal; the input end of the output detection module is connected with the output end of the power adjustment module and is used for detecting the output signal to generate an output detection signal; and the control module is connected with the output end of the input detection module and the output end of the output detection module by the controlled end thereof, and the output end thereof is connected with the controlled end of the power adjustment module and is used for controlling the power adjustment module to stop working under the condition that the input detection signal or the output detection signal is at a low level.

Description

Switching power supply and protection method thereof
Technical Field
The embodiment of the application relates to the technical field of power electronics, in particular to a switching power supply and a protection method thereof.
Background
The switching power supply is also called as a switching power supply and a switching converter, is a high-frequency electric energy conversion device, is widely applied to computer systems using LCD displays, and provides uninterrupted power supply for important equipment such as IDC (Internet Data Center: internet data center) machine rooms, financial systems, data management systems and the like.
In the related art, a switching power supply mostly adopts two power parts of isolated active PFC (Power Factor Corrector, power factor correction) and DC/DC (direct current conversion), so that the conversion of alternating current input into stable direct current input required by a communication power supply is realized.
At present, under certain environments, fluctuation of a power grid or unstable application occasions can lead to power failure and quick restarting of alternating voltage input by a switching power supply, but the switching power supply cannot identify unstable situations and stop working, and continuous working under an unstable state can lead to damage of the switching power supply, shorten the service cycle of the switching power supply, seriously influence the reliability of the switching power supply and limit the application scene of the switching power supply.
Disclosure of Invention
The embodiment of the application mainly aims to provide a switching power supply and a protection method thereof, and aims to protect the switching power supply, prolong the service cycle of the switching power supply, ensure the reliability of the switching power supply and enable the switching power supply to adapt to more use scenes.
To achieve the above object, an embodiment of the present application provides a switching power supply, including:
the filtering module is used for filtering electromagnetic interference in the input alternating current;
the input end of the power adjusting module is connected with the output end of the filtering module, and the power adjusting module is used for carrying out power adjustment on an input signal from the filtering module so as to generate an output signal suitable for load use;
the input detection module is used for detecting the input signal to generate an input detection signal;
the input end of the output detection module is connected with the output end of the power regulation module, and the output detection module is used for detecting the output signal to generate an output detection signal;
the input end of the control module is connected with the output end of the input detection module and the output end of the output detection module, the output end of the control module is connected with the controlled end of the power regulation module, and the control module is used for controlling the power regulation module to stop working under the condition that the input detection signal or the output detection signal is in a low level.
Optionally, the input detection module includes:
the input rectifying unit is used for rectifying the input signal to obtain a first direct current voltage;
the input voltage reduction unit is used for converting the first direct-current voltage into a second direct-current voltage, wherein the first direct-current voltage is larger than the second direct-current voltage;
the input control unit is used for generating the input detection signal according to a comparison result of the second direct-current voltage and a preset input threshold voltage.
Optionally, the input rectifying unit is a half-wave rectifying circuit or a full-wave rectifying circuit, and the input voltage reducing unit includes at least one voltage reducing resistor.
Optionally, the input control unit is an input comparator, a non-inverting input end of the input comparator is connected with an output end of the input voltage reduction unit, an inverting input end of the input comparator is connected with the preset input threshold voltage, an output end of the input comparator is connected with an input end of the control module, and the input comparator is used for outputting an input detection signal with a low level when the second direct current voltage is smaller than the preset input threshold voltage.
Optionally, the output detection module includes:
the input end of the overvoltage detection unit is connected with the output end of the power regulation module, the output end of the overvoltage detection unit is connected with the input end of the control module, and the overvoltage detection unit is used for generating an output detection signal according to a comparison result of the output signal and a first preset output threshold voltage.
Optionally, the overvoltage detection unit is a first comparator, a non-inverting input end of the first comparator is connected to the first preset output threshold voltage, an inverting input end of the first comparator is connected to an output end of the power adjustment module, an output end of the first comparator is connected to an input end of the control module, and the first comparator is used for outputting a low-level output detection signal when the output signal is greater than the first preset output threshold voltage.
Optionally, the output detection module includes:
the input end of the undervoltage detection unit is connected with the output end of the power regulation module, the output end of the undervoltage detection unit is connected with the input end of the control module, and the undervoltage detection unit is used for generating an output detection signal according to a comparison result of the output signal and a second preset output threshold voltage.
Optionally, the under-voltage detection unit is a second comparator, an in-phase input end of the second comparator is connected with an output end of the power adjustment module, an inverting input end of the second comparator is connected with the second preset output threshold voltage, an output end of the second comparator is connected with an input end of the control module, and the second comparator is used for outputting a low-level output detection signal when the output signal is smaller than the second preset output threshold voltage.
Optionally, the power adjustment module includes:
the input end of the power factor correction unit is connected with the output end of the filtering module, the controlled end of the power factor correction unit is connected with the output end of the control module, and the power factor correction unit is used for carrying out power factor correction on an input signal from the filtering module and outputting a correction signal;
the input end of the direct current conversion unit is connected with the output end of the power factor correction unit, and the direct current conversion unit is used for carrying out direct current conversion on the correction signal so as to generate an output signal suitable for load use.
In addition, to achieve the above object, an embodiment of the present application further provides a protection method of a switching power supply, where the protection method of a switching power supply is applied to the switching power supply described above, and the protection method of a switching power supply includes:
detecting an input signal of the switching power supply to generate an input detection signal or detecting an output signal of the switching power supply to generate an output detection signal;
and controlling the switching power supply to stop working under the condition that the input detection signal or the output detection signal is in a low level.
The embodiment of the application provides a switching power supply and a protection method thereof, wherein the switching power supply comprises: the filtering module is used for filtering electromagnetic interference in the input alternating current; the input end of the power adjusting module is connected with the output end of the filtering module, and the power adjusting module is used for carrying out power adjustment on an input signal from the filtering module so as to generate an output signal suitable for load use; the input detection module is used for detecting the input signal to generate an input detection signal; the input end of the output detection module is connected with the output end of the power regulation module, and the output detection module is used for detecting the output signal to generate an output detection signal; the input end of the control module is connected with the output end of the input detection module and the output end of the output detection module, the output end of the control module is connected with the controlled end of the power regulation module, and the control module is used for controlling the power regulation module to stop working under the condition that the input detection signal or the output detection signal is in a low level.
The above-mentioned switching power supply that this application embodiment provided can be through the electric signal fluctuation that input detection module or output detection module accurate discernment electric wire netting was undulant or application unstable arouses to can lead to switching power supply work under unstable state's circumstances through control module control power adjustment module stop work, automatic control switching power supply stop work promptly, realized the protection to switching power supply, can effectively prolong switching power supply's life cycle, guarantee switching power supply's reliability, make switching power supply can adapt to more application scenario, overcome switching power supply among the correlation technique unable technical defect of stopping work by oneself under unstable state.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained from the structures shown in the drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a switching power supply according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an input detection module in a switching power supply according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an output detection module in a switching power supply according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another output detection module in a switching power supply according to an embodiment of the present application;
fig. 5 is a flow chart of a protection method of a switching power supply according to an embodiment of the present application.
The implementation, functional features and advantages of the embodiments of the present application will be further described with reference to the accompanying drawings.
Reference numerals illustrate:
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the embodiments herein.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is correspondingly changed.
In addition, descriptions such as those related to "first," "second," and the like in the embodiments of the present application are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the 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 embodiments of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise. In addition, the meaning of "or" appearing throughout the text is to include three side-by-side schemes, for example, "a or B", including a scheme, or B scheme, or a scheme where a and B meet at the same time.
In the embodiments herein, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "fixed" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
It should also be appreciated that references to "one embodiment" or "some embodiments" or the like described in the specification of embodiments of the present application mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more, but not all, embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The embodiment of the application provides a switching power supply and a protection method thereof, and the switching power supply is specifically described by the following embodiment.
An embodiment of the present application provides a switching power supply, referring to fig. 1, fig. 1 is a schematic structural diagram of the switching power supply provided in an embodiment of the present application, and the switching power supply 01 includes:
the filtering module 10 is used for filtering electromagnetic interference in the input alternating current;
a power adjustment module 20, wherein an input end of the power adjustment module 20 is connected to an output end of the filtering module 10, and the power adjustment module 20 is configured to perform power adjustment on an input signal from the filtering module 10 so as to generate an output signal suitable for use by the load 02;
an input detection module 30, wherein an input end of the input detection module 30 is connected with an input end of the power adjustment module 20, and the input detection module 30 is used for detecting the input signal to generate an input detection signal;
the input end of the output detection module 40 is connected with the output end of the power adjustment module 20, and the output detection module 40 is used for detecting the output signal to generate an output detection signal;
the input end of the control module 50 is connected with the output end of the input detection module 30 and the output end of the output detection module 40, the output end of the control module 50 is connected with the controlled end of the power adjustment module 20, and the control module 50 is used for controlling the power adjustment module 20 to stop working when the input detection signal or the output detection signal is at a low level.
It should be noted that, in this embodiment, the filtering module 10, the power adjusting module 20 and the control module 50 are the same as corresponding functional modules in the common switching power supply in the related art, and the difference is that in order to achieve that in the case of partial unstable input ac, the switching power supply 01 can autonomously identify the situation and stop working, the input end and the output end of the power adjusting module 20 are respectively introduced with the input detecting module 30 and the output detecting module 40, and the output ends of the input detecting module 30 and the output detecting module 40 are both connected with the input end of the control module 50, in this case, the control mode of the control module 50 on the power adjusting module 20 is changed from manual control in the related art to automatic control according to the input detecting signal or the output detecting signal in this embodiment, so that the switching power supply 01 is controlled to stop working in time under the condition of unstable input ac fluctuation or application occasion, and damage to the switching power supply 01 is avoided.
As an example, the power adjustment module 20 includes: the input end of the power factor correction unit is connected with the output end of the filtering module 10, the controlled end of the power factor correction unit is connected with the output end of the control module 50, and the power factor correction unit is used for performing power factor correction on an input signal from the filtering module 10 and outputting a correction signal; and the input end of the direct current conversion unit is connected with the output end of the power factor correction unit, and the direct current conversion unit is used for carrying out direct current conversion on the correction signal so as to generate an output signal suitable for the load 02. It can be understood that the PFC circuit corresponds to the PFC circuit, the DC conversion unit corresponds to the DC/DC converter, and the PFC circuit is determined by the input detection module 30 and the output detection module 40, and therefore, the switching power supply 01 in the embodiment is still obviously different from the switching power supply commonly used in the related art.
As an example, a switching power supply including a PFC circuit is generally controlled by an analog control IC, where the control IC generally needs to collect an output voltage, an output current, and an input voltage of the PFC circuit through a detection pin, and generate a PWM wave through an operation in the control IC to control switching of a MOS transistor in the PFC circuit. However, in the process of collecting output voltage, output current and input voltage, a filter capacitor is necessarily added to perform filter processing, and the filter capacitor is added to enable collected voltage and current to be clean and stable, power of the PFC circuit during starting can be improved, and starting capacity is improved. However, after the input AC voltage AC is powered down, the control IC will continuously emit the PWM wave due to the delay effect of the filter capacitor, until the voltage of the control IC detecting pin drops to the off voltage, the duty ratio of the PWM wave is from small to large (the period from the power failure to the wave emission stopping) at this time, and then the maximum duty ratio is maintained until the PWM wave emission is stopped, usually the driving delay time of the PFC circuit is between several tens millimeters and several hundreds of milliseconds, if the input AC voltage AC is powered up again within the maximum duty ratio time, the MOS tube of the PFC circuit is basically in a state of being always on, a very large current is necessarily generated in the PFC circuit, and the MOS tube of the PFC circuit will be broken down within a very short time, thereby causing a large area of damage to the PFC circuit and even causing a fire phenomenon. In order to avoid such risks, the control module 50 in this embodiment does not directly detect the working current of the PFC circuit any more, but directly connects the detection pin of the detection module 50 (i.e. the input end of the detection module 50) with the input detection module 30 and the output end of the output detection module 40, so as to directly control the switching of the MOS transistor in the PFC circuit according to the level of the input detection signal or the output detection signal, and meanwhile, the control pin of the control module 50 in this embodiment (i.e. the output end of the detection module 50) is still used for controlling the switching of the MOS transistor in the PFC circuit.
The switching power supply 01 provided in this embodiment controls the state of the input detection signal by detecting the AC voltage AC at the input end of the switching power supply 01 (or controls the state of the output detection signal by detecting the output signal at the output end of the switching power supply 01), the input detection signal (or the output detection signal) is input to the control pin of the control IC, and when the control pin of the control IC is at a low level, the PWM wave is immediately turned off, so that the PFC circuit can be effectively protected from being damaged, and after the input AC voltage is turned off, the driving delay time of the PFC can be effectively reduced to within 10 milliseconds, thereby significantly reducing the risk of damage to the PFC circuit.
It should be noted that, the control IC described in this embodiment is a PWM (pulse width modulation) mode control IC, and the type of the control IC should not be considered as limiting the protection scope of this embodiment, and this embodiment may also be applicable when the switching power supply 01 adopts a PFM (pulse frequency modulation) mode control IC, a hybrid modulation (i.e., pulse width-frequency modulation) mode control IC, or other types of control modes.
The embodiment provides a switching power supply, can accurately identify the electric signal fluctuation caused by the fluctuation of a power grid or the instability of an application occasion through an input detection module or an output detection module, and control a power adjustment module to stop working through a control module under the condition that the switching power supply works in an unstable state, namely, automatically control the switching power supply to stop working, so that the protection of the switching power supply is realized, the service cycle of the switching power supply can be effectively prolonged, the reliability of the switching power supply is ensured, the switching power supply can adapt to more use scenes, and the technical defect that the switching power supply in the related art cannot stop working automatically in the unstable state is overcome.
Referring to fig. 2, in some possible embodiments, the input detection module 30 includes:
an input rectifying unit 301, an input end of the input rectifying unit 301 is connected to an input end of the power adjusting module 20, and the input rectifying unit 301 is configured to rectify the input signal to obtain a first direct current voltage;
the input voltage reduction unit 302, wherein an input end of the input voltage reduction unit 302 is connected with an output end of the input rectifying unit 301, and the input voltage reduction unit 302 is used for converting the first direct current voltage into a second direct current voltage, wherein the first direct current voltage is larger than the second direct current voltage;
the input control unit 303, an input end of the input control unit 303 is connected to an output end of the input voltage reducing unit 302, an output end of the input control unit 303 is connected to an input end of the control module 50, and the input control unit 303 is configured to generate the input detection signal according to a comparison result between the second dc voltage and a preset input threshold voltage.
As an example, assuming that the input voltage of the switching power supply 01 is an AC input voltage of 85-264VAC, when the AC input voltage in the switching power supply 01 is powered down, the AC input voltage of the input rectifying unit 301 will be less than 85VAC, by setting circuit parameters, the second dc voltage can be made to be less than a preset input threshold voltage, for example, when the AC input voltage of the rectifying circuit is less than 70VAC, the second dc voltage can be set to be less than the preset input threshold voltage, and an input detection signal of a low level is output to the control module 50 to stop the operation of the power conditioning module 20, so that the problem in the application process of the switching power supply in the related art is solved, the reliability and stability of the operation of the switching power supply are improved, and when the switching power supply 01 is in normal operation, the AC input voltage is a normal voltage at this time, the second dc voltage is greater than or equal to the preset input threshold voltage, and the control module 50 is not controlled to stop the operation of the power conditioning module 20 by the input detection signal of a high level, so that the input detection module 30 in this embodiment does not affect the normal operation of the switching power supply 01.
It should be noted that, the above listed condition that the input voltage of the switching power supply 01 is an ac input voltage of 85-264VAC and the ac voltage is less than 70VAC should not be regarded as limiting the protection scope of the embodiment, and the input voltage scope of the switching power supply 01 aimed at by the input detection protection circuit of the embodiment may be selected and set according to actual requirements.
In addition, in a normal case, the control pin of the control module 50 is triggered at a low level, and the logic relationship between the second dc voltage, the preset input threshold voltage, and the input detection signal is: when the second direct current voltage is greater than or equal to a preset input threshold voltage, the output end of the input control circuit is at a high level; when the second direct current voltage is smaller than the preset input threshold voltage, the output end of the input control circuit is at a low level.
In some possible embodiments, the input rectifying unit 301 is a half-wave rectifying circuit or a full-wave rectifying circuit.
It is understood that the input rectifying unit 301 may be a half-wave rectifying circuit formed by connecting two diodes in parallel, a full-wave rectifying circuit formed by connecting four diodes in parallel, or other rectifying circuits capable of rectifying an ac input voltage to obtain a first dc voltage.
In some possible embodiments, the input buck unit 302 includes at least one buck resistor.
It is to be understood that, in this embodiment, the input voltage dropping unit 302 may be one voltage dropping resistor, or may be a resistor string formed by connecting two or more voltage dropping resistors in series.
In some possible embodiments, the input control unit 303 is an input comparator, where a non-inverting input end of the input comparator is connected to an output end of the input voltage reducing unit 302, an inverting input end of the input comparator is connected to the preset input threshold voltage, an output end of the input comparator is connected to an input end of the control module 50, and the input comparator is configured to output a low-level input detection signal when the second dc voltage is less than the preset input threshold voltage.
It can be understood that the comparator can intuitively know whether the input alternating current fluctuates or whether the application occasion is unstable, and the like, so as to further draw a conclusion whether the switching power supply 01 needs to be controlled to stop working.
Referring to fig. 3, in some possible embodiments, the output detection module 40 includes:
the input end of the overvoltage detection unit 401 is connected to the output end of the power adjustment module 20, the output end of the overvoltage detection unit 401 is connected to the input end of the control module 50, and the overvoltage detection unit 401 is configured to generate the output detection signal according to a comparison result between the output signal and a first preset output threshold voltage.
In some possible embodiments, the overvoltage detection unit 401 is a first comparator, where a non-inverting input terminal of the first comparator is connected to the first preset output threshold voltage, an inverting input terminal of the first comparator is connected to the output terminal of the power adjustment module 20, and an output terminal of the first comparator is connected to the input terminal of the control module 50, and the first comparator is configured to output a low-level output detection signal when the output signal is greater than the first preset output threshold voltage.
Referring to fig. 4, in some possible embodiments, the output detection module 40 includes:
the under-voltage detection unit 402, an input end of the under-voltage detection unit 402 is connected to an output end of the power adjustment module 20, an output end of the under-voltage detection unit 402 is connected to an input end of the control module 50, and the under-voltage detection unit 402 is configured to generate the output detection signal according to a comparison result of the output signal and a second preset output threshold voltage.
In some possible embodiments, the under-voltage detection unit 402 is a second comparator, where a non-inverting input end of the second comparator is connected to the output end of the power adjustment module 20, an inverting input end of the second comparator is connected to the second preset output threshold voltage, and an output end of the second comparator is connected to the input end of the control module 50, and the second comparator is configured to output a low-level output detection signal when the output signal is less than the second preset output threshold voltage.
It should be noted that, in the case where the input detection module 30 is provided to detect whether the input ac power fluctuates, the present embodiment further provides the output detection module 40 for detecting whether the output signal has an abnormal signal phenomenon such as overvoltage (flowing), undervoltage (flowing), or short circuit, as the second reinsurance for protecting the switching power supply 01, it may be understood that the overvoltage detection unit 401 in fig. 3 and the undervoltage detection unit 402 in fig. 4 may exist in the switching power supply 01 at the same time, and the first preset output threshold voltage is obviously greater than the second preset output threshold voltage, and the first comparator and the second comparator may be the same type or different types of components.
It will be appreciated by those skilled in the art that the structures shown in fig. 1-4 do not constitute a limitation on the switching power supply 01, and may include more or fewer components than shown, or may combine certain components, or may have a different arrangement of components.
In addition, the embodiment of the application further provides a protection method of the switching power supply, which can be applied to the switching power supply provided in the above embodiment, and referring to fig. 5, the protection method of the switching power supply includes step S10 and step S20.
Step S10, detecting an input signal of the switching power supply to generate an input detection signal or detecting an output signal of the switching power supply to generate an output detection signal;
and step S20, controlling the switching power supply to stop working when the input detection signal or the output detection signal is at a low level.
The protection method of the switching power supply provided in this embodiment belongs to the same inventive concept as the switching power supply provided in the foregoing embodiment, and technical details not described in detail in this embodiment may be referred to any embodiment described in the foregoing, and this embodiment has the same beneficial effects as those of each embodiment of the foregoing switching power supply.
It should be noted that the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on that a person skilled in the art can implement the embodiments, and when the combination of the technical solutions contradicts or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the embodiments of the present application.
The foregoing is only the preferred embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application, and all equivalent structures or equivalent processes using the descriptions of the embodiments of the present application and the contents of the drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the embodiments of the present application.

Claims (9)

1. A switching power supply, the switching power supply comprising:
the filtering module is used for filtering electromagnetic interference in the input alternating current;
the input end of the power adjusting module is connected with the output end of the filtering module, and the power adjusting module is used for carrying out power adjustment on an input signal from the filtering module so as to generate an output signal suitable for load use;
the input detection module comprises an input rectifying unit, an input voltage reduction unit and an input control unit, wherein the input end of the input rectifying unit is connected with the input end of the power regulation module, and the input rectifying unit is used for rectifying the input signal to obtain a first direct-current voltage; the input end of the input voltage reduction unit is connected with the output end of the input rectifying unit, and the input voltage reduction unit is used for converting the first direct-current voltage into a second direct-current voltage, wherein the first direct-current voltage is larger than the second direct-current voltage; the input end of the input control unit is connected with the output end of the input voltage reduction unit, the output end of the input control unit is connected with the input end of the control module, the input control unit is used for generating an input detection signal according to a comparison result of the second direct current voltage and a preset input threshold voltage, and the input detection signal is used for reflecting whether the input alternating current fluctuates or not;
the input end of the output detection module is connected with the output end of the power regulation module, the output detection module is used for detecting the output signal to generate an output detection signal, and the output detection signal is used for reflecting whether the output signal has overvoltage, undervoltage or short circuit signal abnormality;
the input end of the control module is connected with the output end of the input control unit and the output end of the output detection module, the output end of the control module is connected with the controlled end of the power regulation module, and the control module is used for controlling the power regulation module to stop working under the condition that the input detection signal or the output detection signal is in a low level.
2. The switching power supply as claimed in claim 1, wherein the input rectifying unit is a half-wave rectifying circuit or a full-wave rectifying circuit, and the input voltage-reducing unit includes at least one voltage-reducing resistor.
3. The switching power supply according to claim 1, wherein the input control unit is an input comparator, a non-inverting input terminal of the input comparator is connected to an output terminal of the input voltage reducing unit, an inverting input terminal of the input comparator is connected to the preset input threshold voltage, an output terminal of the input comparator is connected to an input terminal of the control module, and the input comparator is configured to output an input detection signal of a low level when the second dc voltage is smaller than the preset input threshold voltage.
4. The switching power supply of claim 1 wherein said output detection module comprises:
the input end of the overvoltage detection unit is connected with the output end of the power regulation module, the output end of the overvoltage detection unit is connected with the input end of the control module, and the overvoltage detection unit is used for generating an output detection signal according to a comparison result of the output signal and a first preset output threshold voltage.
5. The switching power supply as claimed in claim 4, wherein the overvoltage detection unit is a first comparator, a non-inverting input terminal of the first comparator is connected to the first preset output threshold voltage, an inverting input terminal of the first comparator is connected to an output terminal of the power adjustment module, an output terminal of the first comparator is connected to an input terminal of the control module, and the first comparator is configured to output an output detection signal of a low level when the output signal is greater than the first preset output threshold voltage.
6. The switching power supply of claim 1 wherein said output detection module comprises:
the input end of the undervoltage detection unit is connected with the output end of the power regulation module, the output end of the undervoltage detection unit is connected with the input end of the control module, and the undervoltage detection unit is used for generating an output detection signal according to a comparison result of the output signal and a second preset output threshold voltage.
7. The switching power supply according to claim 6, wherein the undervoltage detection unit is a second comparator, a non-inverting input terminal of the second comparator is connected to an output terminal of the power adjustment module, an inverting input terminal of the second comparator is connected to the second preset output threshold voltage, an output terminal of the second comparator is connected to an input terminal of the control module, and the second comparator is configured to output an output detection signal of a low level when the output signal is smaller than the second preset output threshold voltage.
8. The switching power supply of claim 1 wherein said power conditioning module comprises:
the input end of the power factor correction unit is connected with the output end of the filtering module, the controlled end of the power factor correction unit is connected with the output end of the control module, and the power factor correction unit is used for carrying out power factor correction on an input signal from the filtering module and outputting a correction signal;
the input end of the direct current conversion unit is connected with the output end of the power factor correction unit, and the direct current conversion unit is used for carrying out direct current conversion on the correction signal so as to generate an output signal suitable for load use.
9. A protection method of a switching power supply, wherein the protection method of a switching power supply is applied to the switching power supply according to any one of claims 1 to 8, the protection method of a switching power supply comprising:
detecting an input signal of the switching power supply to generate an input detection signal or detecting an output signal of the switching power supply to generate an output detection signal;
and controlling the switching power supply to stop working under the condition that the input detection signal or the output detection signal is in a low level.
CN202311348222.8A 2023-10-18 2023-10-18 Switching power supply and protection method thereof Active CN117096834B (en)

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