CN112710963A - Switching power supply fault detection method based on pulse response - Google Patents
Switching power supply fault detection method based on pulse response Download PDFInfo
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Abstract
The invention discloses a switching power supply fault detection method based on pulse 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 pulse response of the switching power supply, and the parameters used in the calculation process are few. 2. The invention detects at the output end of the switching power supply, does not need to disassemble the internal structure of the power supply, is a non-invasive switching power supply fault detection method, and can realize real-time online monitoring of the output filter capacitor when the switching power supply normally works. 3. The method is suitable for various types of switching power supplies, such as a Buck converter, a Boost converter, a Buck-Boost converter, a Forward converter, a Flyback converter, a Cuk converter and the like.
Description
Technical Field
The invention belongs to the technical field of switching power supply fault detection, and particularly relates to a switching power supply fault detection method based on pulse 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 be considered almost as the most important component in the circuitry, and whether they are working properly directly affects the safety of the power electronics.
Therefore, the method is very important for detecting the switching power supply, most of the existing detection methods are complex, parameters involved in the calculation process are very many, the problems of complex calculation and the like exist, and the detection efficiency is greatly reduced.
Therefore, the prior art is to be improved.
Disclosure of Invention
The main objective of the present invention is to provide a method for detecting a fault of a switching power supply based on an impulse response, so as to solve the technical problems mentioned in the background art.
The invention relates to 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 the first switching power supply to obtain a first pulse response signal generated by the output end of the first switching power supply;
step S20, connecting a first capacitor in parallel at the output end of the first switch power supply, and adding a second pulse current to the output end of the switch power supply to obtain a second pulse response signal generated at the output end of the first switch power supply;
step S30, calculating the capacitance value of the output capacitor of the switching power supply according to the first relevant parameter of the first impulse response signal and the second relevant parameter of the second impulse response signal;
and step S40, comparing the calculated capacitance value of the output capacitor of the switching power supply with a standard capacitance value to realize the fault detection of the switching power supply.
Preferably, the first pulse current in step S10 is the same as the second pulse current in step S20.
Preferably, step S30 specifically includes:
step S31, detecting a first correlation parameter corresponding to the first impulse response signal by using a frequency detector, where the first correlation parameter includes 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, where the second correlation parameter includes a second oscillation period or a second oscillation frequency;
and step S33, calculating the capacitance value of the output capacitor of the switching power supply according to the first relevant parameter, the second relevant parameter and the first capacitor.
Preferably, step S40 specifically includes:
step S41, judging whether the capacitance value of the output capacitor of the switch power supply is lower than the standard capacitance value;
in step S42, if the capacitance value of the output capacitor of the switching power supply is lower than the standard capacitance value, the switching power supply circuit fails.
The switching power supply fault detection method based on the impulse response has the following beneficial effects:
1. the capacitance value of the output capacitor of the switching power supply can be solved only by detecting the oscillation frequency or the oscillation period of the output pulse response of the switching power supply, and the parameters used in the calculation process are few.
2. The invention detects at the output end of the switching power supply, does not need to disassemble the internal structure of the power supply, is a non-invasive switching power supply fault detection method, and can realize real-time online monitoring of the output filter capacitor when the switching power supply normally works. .
3. The method is suitable for various types of switching power supplies, such as a Buck converter, a Boost converter, a Buck-Boost converter, a Forward converter, a Flyback converter, a Cuk converter 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 needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart of a first embodiment of a method for detecting a fault of a switching power supply based on an impulse response according to the present invention;
FIG. 2 is a detailed flowchart of step S30 in the first embodiment of the present invention;
FIG. 3 is a detailed flowchart of step S40 in the first embodiment of the present invention;
FIG. 4 is a waveform diagram of a first impulse response signal according to the present invention;
FIG. 5 is a waveform diagram of a second impulse response signal according to the present invention;
FIG. 6 is a block diagram of a system for detecting the load mutations mentioned in the principles.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is noted that relative terms such as "first," "second," and the like may be used to describe various components, but these terms are not intended to limit the components. These terms are only used to distinguish one component from another component. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention. The term "and/or" refers to a combination of any one or more of the associated items and the descriptive items.
As shown in fig. 1, fig. 1 is a schematic flowchart of a first embodiment of a method for detecting a fault of a switching power supply based on an impulse response according to the present invention; the invention relates to 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 terminal of the first switching power supply, to obtain a first pulse response signal generated at the output terminal of the first switching power supply (as shown in fig. 4);
in step S10, a first pulse current is added to the output terminal of the switching power supply by using a pulse injection circuit;
step S20, connecting a first capacitor in parallel at the output end of the first switching power supply, and adding a second pulse current to the output end of the switching power supply to obtain a second pulse response signal (as shown in fig. 5) generated at the output end of the first switching power supply, where 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 terminal of the switching power supply connected with a first capacitor in parallel; wherein, preferably, the first pulse current in the step S10 is the same as the second pulse current in the step S20.
Step S30, calculating the capacitance value of the output capacitor of the switching power supply according to the first relevant parameter of the first impulse response signal and the second relevant 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 Ts1Or a first oscillation frequency comprising a first angular frequency w1Or the first frequency f1；
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 Ts2Or a second oscillation frequency comprising a second angular frequency w2Or a second frequency f2；
And step S33, calculating the capacitance value of the output capacitor of the switching power supply according to the first relevant parameter, the second relevant 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 Ts1The first angular frequency is w1The first frequency is f1The capacitance value of the output capacitor of the switching power supply is C1(ii) a In step S20, the capacitance value of the first capacitor connected in parallel is x, and the second oscillation period of the second impulse response signal is Ts2The second angular frequency is w2The second frequency is f2The total capacitance value of the capacitor is C2。
Therefore, the capacitance value of the output end capacitor of the switching power supply can be solved by using the formula (10). Wherein, the expression of k is shown as (9), and the first oscillation period is T through different three groups of datas1And the second oscillation period is Ts2The first angular frequency is w1And a second angular frequency of w2A first frequency f1And a second frequency f2(ii) a Any one of the three sets of data can be used to find out the value of k, and x is the capacitance of the first capacitor connected in parallel in step S20, and the capacitance of the parallel capacitor, C, matching with the measured output capacitance of the switching power supply can be selected according to the grade of the output capacitance1Is the capacitance value of the output capacitor of the switch power supply to be tested.
And step S40, comparing the calculated capacitance value of the output capacitor of the switching power supply with a standard capacitance value to realize the 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 switch power supply is lower than the standard capacitance value;
in step S42, if the capacitance value of the output capacitor of the switching power supply is lower than the standard capacitance value, the switching power supply circuit fails.
The switching power supply fault detection method based on the impulse response 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 pulse response of the switching power supply, and the parameters used in the calculation process are few.
2. The invention detects at the output end of the switching power supply, does not need to disassemble the internal structure of the power supply, is a non-invasive switching power supply fault detection method, and can realize real-time online monitoring of the output filter capacitor when the switching power supply normally works.
3. The method is suitable for various types of switching power supplies, such as a Buck converter, a Boost converter, a Buck-Boost converter, a Forward converter, a Flyback converter, a Cuk converter and the like.
4. The invention is connected with a capacitor with a known capacitance value in parallel, and the capacitance value of the parallel capacitor matched with the capacitor is selected according to the grade of the output capacitor of the switching power supply, so that the performance of the switching power supply can not be reduced by the parallel capacitor.
5. The method provided by the invention can be used for detecting the fault condition of the switching power supply on line and can also be used for detecting the fault condition of the switching power supply off line.
6. By the method, the capacitance value of the output capacitor is detected and compared with the standard value of the capacitor, 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 capacitance values of the output capacitors in different service times can be obtained by long-term detection in the use process of the switching power supply, and the aging condition and the service life condition of the power supply can be judged according to the change condition of the capacitance values of the output capacitors.
The detection principle utilized in the present invention is as follows:
the switching power supply main topology comprises a post-stage filter circuit, an output capacitor in the filter circuit has a great influence on the performance of the whole power supply, when the output load of the switching power supply is suddenly changed, the sudden change of the current is directly shown, and a system block diagram of the sudden change of the load of the switching power supply is shown in fig. 6.
In the system block diagram, T(s) is a transfer function of a feedback loop of the switching power supply, and the feedback loop is composed of a switching power supply compensation network, a PWM module, a switching power supply main topology module and an inverseThe feedback voltage divider network and other modules determine together, so that the t(s) of different switching power supplies are different. ZoutIs output impedance, I(s) is abrupt current, Vref(s) is a reference voltage, and V(s) is a switching power supply output voltage. Therefore, after the sudden change 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 all links of the switching power supply into consideration, the output response of the switching power supply can be obtained as an expression (2), wherein K is a constant related to a topological loop parameter of the switching power supply and an added sudden change load, M is another constant related to the loop parameter, and L, C, R is an inductor, a capacitor and a load resistor of an output filter circuit in a main topology of the switching power supply.
Therefore, the natural oscillation angular frequency of the whole switching power supply is shown as formula (3), the damped oscillation angular frequency is shown as formula (4), and Q is a quality factor. The switching power supply oscillation frequency is therefore dependent on 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 angular frequency and the oscillation frequency is shown as (5).
w＝2πf (5)
After the detection principle is known, the method for detecting the fault of the switching power supply based on the impulse response is an effective detection method which is novel and creative and is suitable for various different types of switching power supplies.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A switching power supply fault detection method based on impulse response is characterized by comprising the following steps:
step S10, adding a first pulse current to the output end of the first switching power supply to obtain a first pulse response signal generated by the output end of the first switching power supply;
step S20, connecting a first capacitor in parallel at the output end of the first switch power supply, and adding a second pulse current to the output end of the switch power supply to obtain a second pulse response signal generated at the output end of the first switch power supply;
step S30, calculating the capacitance value of the output capacitor of the switching power supply according to the first relevant parameter of the first impulse response signal and the second relevant parameter of the second impulse response signal;
and step S40, comparing the calculated capacitance value of the output capacitor of the switching power supply with a standard capacitance value to realize the fault detection of the switching power supply.
2. The method of claim 1, wherein the first pulse current of the step S10 is the same as the second pulse current of the step S20.
3. The method for detecting the fault of the switching power supply based on the impulse response as claimed in claim 1, wherein the step S30 specifically includes:
step S31, detecting a first correlation parameter corresponding to the first impulse response signal by using a frequency detector, where the first correlation parameter includes 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, where the second correlation parameter includes a second oscillation period or a second oscillation frequency;
and step S33, calculating the capacitance value of the output capacitor of the switching power supply according to the first relevant parameter, the second relevant parameter and the first capacitor.
4. The method for detecting the fault of the switching power supply based on the impulse response as claimed in claim 1, wherein the step S40 specifically includes:
step S41, judging whether the capacitance value of the output capacitor of the switch power supply is lower than the standard capacitance value;
in step S42, if the capacitance value of the output capacitor of the switching power supply is lower than the standard capacitance value, the switching power supply circuit fails.
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| CN113945857A (en) * | 2021-10-25 | 2022-01-18 | 上海电气风电集团股份有限公司 | Detection device and method for switching power supply |
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