CN112710963B - Switching power supply fault detection method based on impulse response - Google Patents
Switching power supply fault detection method based on impulse response Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The application discloses a switching power supply fault detection method based on impulse response, which has the following beneficial effects: 1. the capacitance value of the output capacitor can be solved by only detecting the oscillation frequency or the oscillation period of the output impulse response of the switching power supply, and the parameters used in the calculation process are few. 2. The application detects at the output end of the switching power supply without dismantling the internal structure of the power supply, is a non-invasive switching power supply fault detection method, and can realize real-time on-line monitoring of the output filter capacitor when the switching power supply works normally. 3. And the power supply is applicable to various types of switching power supplies, such as Buck converters, boost converters, buck-Boost converters, forward converters, flyback converters, cuk converters and the like.
Description
Technical Field
The application belongs to the technical field of switching power supply fault detection, and particularly relates to a switching power supply fault detection method based on impulse response.
Background
At present, the switching power supply has a series of advantages of small volume, light weight, strong anti-interference capability, modularization and the like, and is widely applied to aerospace, communication, nuclear power and other various electronic products. Switching power supplies can almost be considered to be the most important component in circuitry, whether or not they are operating properly directly affects the safety of the power electronics.
Therefore, the method is very important for detecting the switching power supply, most of the current detection methods are complex, the parameters involved in the calculation process are very large, the problems of complex calculation and the like exist, and the detection efficiency is greatly slowed down.
Accordingly, the prior art is in need of improvement.
Disclosure of Invention
The application mainly aims to provide a switching power supply fault detection method based on impulse response so as to solve the technical problems in the background art.
The application discloses a switching power supply fault detection method based on impulse response, which comprises the following steps:
step S10, adding a first pulse current to the output end of a first switching power supply to obtain a first pulse response signal generated by the output end of the first switching power supply;
step S20, a first capacitor is connected in parallel with the output end of the first switching power supply, and a second pulse current is added to the output end of the switching power supply to obtain a second pulse response signal generated by the output end of the first switching power supply;
step S30, calculating the capacitance value of the output capacitor of the switching power supply according to the first related parameter of the first impulse response signal and the second related parameter of the second impulse response signal;
and S40, comparing the calculated capacitance value of the output capacitor of the switching power supply with a capacitance standard value to realize fault detection of the switching power supply.
Preferably, the first pulse current in step S10 is the same as the second pulse current of step S20.
Preferably, step S30 specifically includes:
step S31, detecting a first relevant parameter corresponding to the first impulse response signal by using a frequency detector, wherein the first relevant parameter comprises a first oscillation period or a first oscillation frequency;
step S32, detecting a second correlation parameter corresponding to the second impulse response signal by using a frequency detector, wherein the second correlation parameter comprises a second oscillation period or a second oscillation frequency;
step S33, calculating the capacitance value of the output capacitor of the switching power supply according to the first related parameter, the second related parameter and the first capacitor.
Preferably, step S40 specifically includes:
step S41, judging whether the capacitance value of the output capacitor of the switching power supply is lower than a standard capacitance value;
in step S42, if the capacitance of the output capacitor of the switching power supply is lower than the standard capacitance, the switching power supply circuit fails.
The impulse response-based switching power supply fault detection method has the following beneficial effects:
1. the capacitance value of the output capacitor of the switching power supply can be solved by only detecting the oscillation frequency or the oscillation period of the output impulse response of the switching power supply, and the parameters used in the calculation process are few.
2. The application detects at the output end of the switching power supply without dismantling the internal structure of the power supply, is a non-invasive switching power supply fault detection method, and can realize real-time on-line monitoring of the output filter capacitor when the switching power supply works normally. .
3. And the power supply is applicable to various types of switching power supplies, such as Buck converters, boost converters, buck-Boost converters, forward converters, flyback converters, cuk converters and the like.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic flow chart of a first embodiment of a switching power supply fault detection method based on impulse response according to the present application;
fig. 2 is a schematic diagram of a refinement flow chart of step S30 in the first embodiment of the present application;
FIG. 3 is a detailed flowchart of step S40 in the first embodiment of the present application;
FIG. 4 is a waveform diagram of a first impulse response signal according to the present application;
FIG. 5 is a waveform diagram of a second impulse response signal according to the present application;
FIG. 6 is a block diagram of a load mutation system as mentioned in the detection principle.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It is noted that related terms such as "first," "second," and the like may be used to describe various components, but these terms are not limiting of the components. These terms are only used to distinguish one element from another element. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the scope of the present application. The term "and/or" refers to any one or more combinations of related items and descriptive items.
Referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of a switching power supply fault detection method based on impulse response according to the present application; the application discloses a switching power supply fault detection method based on impulse response, which comprises the following steps:
step S10, adding a first pulse current to the output end of a first switching power supply to obtain a first pulse response signal generated by the output end of the first switching power supply (shown in FIG. 4);
in step S10, adding a first pulse current to the output terminal of the switching power supply by using a pulse injection circuit;
step S20, a first capacitor is connected in parallel with the output end of the first switching power supply, and a second pulse current is added to the output end of the switching power supply to obtain a second pulse response signal (shown in FIG. 5) generated by the output end of the first switching power supply, wherein the capacitance value of the first capacitor is x;
in step S20, a pulse injection circuit is used to add a second pulse current to the output end of the switching power supply connected in parallel with a first capacitor; wherein, the first pulse current in step S10 is preferably the same as the second pulse current of step S20.
Step S30, calculating the capacitance value of the output capacitor of the switching power supply according to the first related parameter of the first impulse response signal and the second related parameter of the second impulse response signal;
as shown in fig. 2, step S30 specifically includes:
step S31, detecting a first correlation parameter corresponding to the first impulse response signal by using a frequency detector, wherein the first correlation parameter includes a first oscillation period T s1 Or a first oscillation frequency including a first angular frequency w 1 Or a first frequency f 1 ；
Step S32, detecting second correlation information corresponding to the second impulse response signal by using the frequency detector, wherein the second correlation parameter includes a second oscillation period T s2 Or a second oscillation frequency including a second angular frequency w 2 Or a second frequency f 2 ；
Step S33, calculating the capacitance value of the output capacitor of the switching power supply according to the first related parameter, the second related parameter and the first capacitor.
In the step S33 of the process of the present application,the specific calculation process is as follows:
wherein the first oscillation period of the first impulse response signal is T s1 A first angular frequency w 1 The first frequency is f 1 The capacitance value of the output capacitor of the switching power supply is C 1 The method comprises the steps of carrying out a first treatment on the surface of the In step S20, the capacitance of the first capacitor connected in parallel is x, and the second oscillation period of the second impulse response signal is T s2 The second angular frequency is w 2 The second frequency is f 2 The total capacitance value is C 2 。
Therefore, the capacitance value of the output end capacitor of the switching power supply can be solved by using the formula (10). Wherein k is expressed as (9) by three different sets of data, such as the first oscillation period T s1 And a second oscillation period of T s2 A first angular frequency w 1 And a second angular frequency w 2 First frequency f 1 And a second frequency f 2 The method comprises the steps of carrying out a first treatment on the surface of the Any one of the three sets of data can solve the value of k, and x is the capacitance value of the first capacitor connected in parallel in the step S20, and the capacitance value of the parallel capacitor matched with the measured output capacitance of the switching power supply can be selected according to the level of the output capacitance of the switching power supply, C 1 Is the capacitance of the output capacitor of the switch power supply.
And S40, comparing the calculated capacitance value of the output capacitor of the switching power supply with a capacitance standard value to realize fault detection of the switching power supply.
As shown in fig. 3, preferably, step S40 specifically includes:
step S41, judging whether the capacitance value of the output capacitor of the switching power supply is lower than a standard capacitance value;
in step S42, if the capacitance of the output capacitor of the switching power supply is lower than the standard capacitance, the switching power supply circuit fails.
The impulse response-based switching power supply fault detection method has the following beneficial effects:
1. the capacitance value of the output capacitor can be solved by only detecting the oscillation frequency or the oscillation period of the output impulse response of the switching power supply, and the parameters used in the calculation process are few.
2. The application detects at the output end of the switching power supply without dismantling the internal structure of the power supply, is a non-invasive switching power supply fault detection method, and can realize real-time on-line monitoring of the output filter capacitor when the switching power supply works normally.
3. And the power supply is applicable to various types of switching power supplies, such as Buck converters, boost converters, buck-Boost converters, forward converters, flyback converters, cuk converters and the like.
4. The application connects a capacitor with known capacitance in parallel, and selects the capacitance of the parallel capacitor matched with the output capacitance of the switch power supply according to the grade of the output capacitance of the switch power supply, and the parallel capacitor does not reduce the performance of the switch power supply.
5. The method provided by the application can be used for detecting the fault condition of the switching power supply on line and detecting the fault condition of the switching power supply off line.
6. The method detects the capacitance value of the output capacitor and compares the capacitance value with the standard value of the capacitor, so that the working state of the switching power supply can be detected, and the fault condition of the switching power supply can be judged.
7. The long-term detection can be carried out in the use process of the switching power supply, the capacitance value of the output capacitor in different use time can be obtained, and the aging condition and the service life condition of the power supply can be judged according to the change condition of the capacitance value of the output capacitor.
The detection principle used in the application is as follows:
the switching power supply main topology comprises a post-stage filter circuit, the output capacitance in the filter circuit has great influence on the performance of the whole power supply, when the output load of the switching power supply changes suddenly, the current changes suddenly most directly, and a switching power supply load mutation system block diagram is shown in figure 6.
In the system block diagram, T(s) is a transfer function of a feedback loop of the switching power supply, and is determined by a switching power supply compensation network, a PWM module, a switching power supply main topology module, a feedback voltage division network and other modules, so that T(s) of different switching power supplies are different. Z is Z out Is the output impedance, I(s) is the abrupt current, V ref (s) is a reference voltage, and V(s) is a switching power supply output voltage. Therefore, after the abrupt load is added to the output end of the switching power supply, the output voltage of the switching power supply is as shown in formula (1):
taking into account the various links of the switching power supply, the output response of the switching power supply can be obtained as formula (2), wherein K is a constant related to the topology loop parameter of the switching power supply and the added abrupt load, M is another constant related to the loop parameter, and L, C, R is the inductance and capacitance of the output filter circuit and the load resistance in the main topology of the switching power supply.
Therefore, the natural oscillation angular frequency of the whole switching power supply is shown as a formula (3), the damped oscillation angular frequency is shown as a formula (4), and Q is a quality factor. The switching power supply oscillation frequency is thus related to the capacitance and inductance of the output filter stage.
For a designed switching power supply, the control loop parameters of the power supply are considered to be fixed, the main topology parameters are also fixed, and the relation between the oscillation angle frequency and the oscillation frequency is shown as (5).
w＝2πf (5)
After the detection principle is known, the impulse response-based switching power supply fault detection method is a novel and creative effective detection method applicable to various different types of switching power supplies.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (3)
1. The switching power supply fault detection method based on impulse response is characterized by comprising the following steps of:
step S10, adding a first pulse current to the output end of a first switching power supply to obtain a first pulse response signal generated by the output end of the first switching power supply;
step S20, a first capacitor is connected in parallel with the output end of the first switching power supply, and a second pulse current is added to the output end of the switching power supply to obtain a second pulse response signal generated by the output end of the first switching power supply;
step S30, calculating the capacitance value of the output capacitor of the switching power supply according to the first related parameter of the first impulse response signal and the second related parameter of the second impulse response signal;
step S40, comparing the calculated capacitance value of the output capacitor of the switching power supply with a capacitance standard value to realize fault detection of the switching power supply;
the step S30 specifically includes:
step S31, detecting a first relevant parameter corresponding to the first impulse response signal by using a frequency detector, wherein the first relevant parameter comprises a first oscillation period or a first oscillation frequency;
step S32, detecting a second correlation parameter corresponding to the second impulse response signal by using a frequency detector, wherein the second correlation parameter comprises a second oscillation period or a second oscillation frequency;
step S33, calculating the capacitance value of the output capacitor of the switching power supply according to the first related parameter, the second related parameter and the first capacitor;
in step S33, the specific calculation process is:
wherein the first oscillation period of the first impulse response signal is T s1 A first angular frequency w 1 The first frequency is f 1 The capacitance value of the output capacitor of the switching power supply is C 1 The method comprises the steps of carrying out a first treatment on the surface of the In step S20, the capacitance of the first capacitor connected in parallel is x, and the second oscillation period of the second impulse response signal is T s2 The second angular frequency is w 2 First, theTwo frequencies f 2 The total capacitance value is C 2 The method comprises the steps of carrying out a first treatment on the surface of the Where K is a constant related to the topology loop parameters of the switching power supply and the added abrupt load, M is also another constant related to the loop parameters, and L is the inductance of the output filter circuit in the main topology of the switching power supply.
2. The method of claim 1, wherein the first pulse current in step S10 is the same as the second pulse current in step S20.
3. The method for detecting a switching power supply failure based on impulse response as claimed in claim 1, wherein the step S40 specifically comprises:
step S41, judging whether the capacitance value of the output capacitor of the switching power supply is lower than a standard capacitance value;
in step S42, if the capacitance of the output capacitor of the switching power supply is lower than the standard capacitance, the switching power supply circuit fails.
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