CN113433480B - Fault early warning method for control power supply system - Google Patents

Fault early warning method for control power supply system Download PDF

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Publication number
CN113433480B
CN113433480B CN202110729520.6A CN202110729520A CN113433480B CN 113433480 B CN113433480 B CN 113433480B CN 202110729520 A CN202110729520 A CN 202110729520A CN 113433480 B CN113433480 B CN 113433480B
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switching
fault
period
power supply
value
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CN113433480A (en
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陈瑞军
张钢
刘占英
刘志刚
王晓东
邱瑞昌
刘楠
陈杰
彭府君
金哲铭
冀欣
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Hohhot Urban Rail Transit Construction Management Co ltd
Beijing Jiaotong University
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Hohhot Urban Rail Transit Construction Management Co ltd
Beijing Jiaotong University
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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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
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    • G08B21/185—Electrical failure alarms

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Abstract

The invention provides a fault early warning method for a control power supply system. The method comprises the following steps: collecting and controlling output voltage ripple data of a power supply system; analyzing the collected historical voltage ripple data and predicting switching pulses in the current switching period; and judging whether the switching tube has a fault or not according to the switching pulse of the current switching period and the voltage ripple data actually acquired by the current switching period, and determining the fault type. The method adopts a mode of predicting switching pulse, realizes the fault early warning of the switching tube under the condition of not invading and controlling the interior of the power supply equipment, has small influence on a power supply system and has strong practicability; the output voltage detection mode is adopted, so that the signal acquisition amount is small, and the realization is convenient; by adopting the method, the fault can be detected in a switching period after the switching tube is in fault, and the fault detection efficiency is high.

Description

Fault early warning method for control power supply system
Technical Field
The invention relates to the technical field of control power supply fault detection, in particular to a fault early warning method for a control power supply system.
Background
The control power supply is a very popular application in power electronic technology, has the characteristics of low power consumption, high efficiency, energy conservation and the like, is widely applied to various electronic equipment, and is mainly used for providing a stable and high-quality working power supply for a post-stage circuit. The control power supply is used as a core component of various electronic devices, although the cost of the control power supply is low, once a fault occurs, if the fault cannot be found quickly and corresponding measures are taken, devices in a circuit are burnt, even the whole electronic device is damaged seriously, and huge loss is caused to property.
At present, a method for early warning a failure of a switching device of a control power supply system in the prior art includes: the method comprises the steps of collecting a switch pulse signal or current signals of an inductor and a capacitor, and identifying the fault type of a switch device according to the difference of current changes under different faults.
The method for early warning the fault of the switching device of the control power supply system in the prior art has the following defects: in practical application, under the condition of not invading the interior of equipment, a switching pulse signal cannot be obtained generally; the control power supply device is rarely provided with a direct sampling interface for inductor and capacitor current, and the current sampling is indirectly carried out on the inductor and the capacitor, so that the precision is low, and the implementation difficulty is high.
Disclosure of Invention
The embodiment of the invention provides a fault early warning method for a control power supply system, which is used for effectively detecting faults of a switching device in the control power supply system.
In order to achieve the purpose, the invention adopts the following technical scheme.
A fault early warning method for a control power supply system comprises the following steps:
collecting and controlling output voltage ripple data of a power supply system;
analyzing the collected historical voltage ripple data and predicting switching pulses in the current switching period;
and judging whether the switching tube has a fault or not according to the predicted switching pulse of the current switching period and the voltage ripple data actually acquired in the current switching period, and determining the fault type.
Preferably, the acquiring the output voltage ripple data of the control power supply system includes:
the output voltage of the power supply system is collected and controlled through the voltage sensor, and voltage ripple data are obtained after the output voltage passes through the blocking circuit and the amplifier.
Preferably, the analyzing the collected historical voltage ripple data to predict the switching pulse in the current switching period includes:
s201: calculating the slope of the collected historical voltage ripple data to obtain the slope k of the output voltage ripplev；
Figure GDA0003515147530000021
Wherein k isv[n]Is the slope of the output voltage at the nth sampling point, Uout[n]Is the nth output voltage sampling value, and delta t is the sampling time interval;
s202: calculating the sign coefficient K of the voltage ripple slopev：
Figure GDA0003515147530000022
When K isvWhen the value is 1, the switch tube is in a closed state; when K isvWhen the value is 0, the switching tube is in a disconnected state;
setting the first three switching periods T1、T2And T3For historical switching periods, switching period T4For the current switching period, the switching period T is set3Time period KvThe time point of the rising edge of the waveform is recorded as t1At a time point t1Is recorded as t at the time point of the next falling edge2At a time point t2Is recorded as t at the next rising edge time point3Controlling the power supply at T3Switching period T of time segmentsThe calculation formula with the duty ratio D is as follows:
Ts＝t3-t1
Figure GDA0003515147530000023
s203: predicting the current switching period T4The switching pulse of (2):
Figure GDA0003515147530000024
wherein
Figure GDA0003515147530000025
For switching pulses during a switching period T4The value of (1) represents high level, and the value of (0) represents low level.
Preferably, the method further comprises: when the switch tube closing duration of the switch period T4 is detected to be greater than the historical switch period TsIf so, judging that the switching tube has a short-circuit fault, and sending a short-circuit fault alarm; when the switch tube disconnection time length of the switch period T4 is detected to be greater than the historical switch period TsAnd if so, judging that the switching tube has an open circuit fault and giving an open circuit fault alarm.
Preferably, the determining whether the switching tube has a fault according to the predicted switching pulse of the current switching cycle and the actually collected voltage ripple data of the current switching cycle and determining the fault type includes:
s301: in the current switching period T4According to the predicted switching pulse, the voltage ripple slope index coefficient K is detected when the switching tube is respectively switched on and switched offvA value of (d);
s302: in the current switching period, according to the predicted switching pulse and the slope index coefficient K obtained by detectionvA fault logic judgment is made and,
firstly, when
Figure GDA0003515147530000031
Has a value of 1 and KvWhen the value of the voltage is 1, judging that the switching tube has no open circuit fault, and not giving out an alarm;
② when
Figure GDA0003515147530000032
Has a value of 1 and KvWhen the value of the voltage is 0, judging that the switching tube has an open circuit fault, and sending out an open circuit fault alarm;
③ when
Figure GDA0003515147530000033
Has a value of 0 and KvWhen the value of the voltage is 1, judging that the switching tube has a short-circuit fault, and sending a short-circuit fault alarm;
fourthly when
Figure GDA0003515147530000034
Has a value of 0 and KvWhen the value of (1) is 0, judging that the switch tube has no short-circuit fault, and not giving out an alarm.
Preferably, the method further comprises:
detecting the switching period T4After the inner switching tube breaks down, continuing to predict switching pulses of a subsequent switching period, judging whether the fault still exists in the subsequent switching period, if the fault in the subsequent switching period is eliminated, judging that the switching tube breaks down in a short time, recording the fault type and sending a short-time fault alarm; if the fault still exists in the subsequent switching period, the permanent fault of the closed tube is judged, the fault type is recorded, and a permanent fault alarm is sent out.
According to the technical scheme provided by the embodiment of the invention, the method of the embodiment of the invention adopts a mode of predicting the switching pulse, realizes the fault early warning of the switching tube under the condition of not invading and controlling the interior of the power supply equipment, has small influence on the power supply system and strong practicability; the output voltage detection mode is adopted, so that the signal acquisition amount is small, and the realization is convenient; by adopting the method, the fault can be detected in a switching period after the switching tube is in fault, and the fault detection efficiency is high.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating an implementation principle of a fault early warning method for controlling a power supply system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a correspondence relationship between an output voltage ripple of a single-ended forward circuit and a pulse of a switching tube according to an embodiment of the present invention;
fig. 3 is a processing flow chart of a fault early warning method for controlling a power supply system according to an embodiment of the present invention;
fig. 4 is a flowchart of a process for predicting a switching pulse of a current switching period by analyzing collected historical voltage ripple data according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a fault condition of a switching tube is determined according to obtained historical information of a control power supply according to an embodiment of the present invention;
fig. 6 is a processing flow chart for determining whether a switching tube is faulty and the type of the fault according to the predicted switching pulse and the voltage ripple data actually collected in the current switching period according to the embodiment of the present invention;
FIG. 7 is a diagram of an optimized on-off period T according to an embodiment of the present invention4In accordance with
Figure GDA0003515147530000041
And KvThe value of (2) is used for judging whether the switching tube has a fault of open circuit or short circuit or not and whether the switching tube has no fault;
fig. 8 is a flowchart of a process for determining whether a switching tube fault or a short-term fault occurs according to a predicted switching pulse and voltage ripple data actually collected in a current switching period according to an embodiment of the present invention;
fig. 9 is a schematic diagram for determining whether a switching tube fault is a short-time fault according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The control power supply, although of its own low cost, can cause significant losses in the event of a failure. The switching tube is used as a core component of a control power supply, and when a permanent fault occurs, the switching tube is generally expected to be capable of quickly determining the fault type and performing corresponding protection action so as to avoid damage; when short-time fault occurs, the average value of the output voltage and current of the power supply is less influenced, and the detection is difficult generally. However, when the switching tube of the control power supply frequently has a short-time fault, the control power supply generally reaches the service life limit, so that the early warning can be performed through the occurrence frequency of the short-time fault.
The implementation principle schematic diagram of the fault early warning method for the control power supply system provided by the embodiment of the invention is shown in fig. 1, and the fault early warning of the switch tube of the control power supply system is completed in a mode of predicting the switch pulse without invading the control power supply. The method only needs to collect and control the output voltage of the power supply, has small influence on power supply equipment, is easy to realize, and can effectively early warn the fault of the switching tube.
The schematic diagram of the corresponding relationship between the output voltage ripple of the single-ended forward circuit and the pulse of the switching tube is shown in fig. 2, and the main circuit of the control power supply in the embodiment is the single-ended forward circuit, and the working principle of the single-ended forward circuit can know that the output voltage ripple of the single-ended forward circuit and the pulse of the switching tube have the corresponding relationship, that is, when the switching pulse is at a high level, the switching tube is closed, the output voltage ripple rises, and the slope is positive; when the switching pulse is at a low level, the switching tube is disconnected, the output voltage ripple is reduced, and the slope is negative. Based on the correlation between the voltage ripple and the switching pulse, the switching pulse can be estimated by detecting the ripple of the output voltage. The invention provides a fault early warning method for a control power supply system by utilizing the rule, which has the following basic idea: firstly, collecting output voltage ripple data, then predicting the current switching period switching pulse according to the collected historical voltage data, and finally judging whether the switching tube has a fault or not by using the predicted switching pulse and the actually collected current switching period voltage ripple.
As shown in fig. 3, a processing flow chart of a fault early warning method for controlling a power supply system according to an embodiment of the present invention is provided, where the method includes the following steps:
step S100: and collecting and controlling output voltage ripple data of the power supply system.
Step S200: and analyzing the collected historical voltage ripple data and predicting the switching pulse of the current switching period.
Step S300: judging whether a switching tube has a fault and a fault type according to the predicted switching pulse and voltage ripple data actually acquired in the current switching period, and determining whether to alarm;
preferably, the step S100 specifically includes acquiring an output voltage of the control power supply system by using a voltage sensor, and obtaining voltage ripple data after passing the output voltage through a dc blocking circuit and an amplifier.
Fig. 4 is a flowchart of a process for predicting a switching pulse of a current switching period by analyzing collected historical voltage ripple data according to an embodiment of the present invention, and as shown in fig. 4, step S200 includes the following steps:
s201: calculating the slope of the collected historical voltage ripple data to obtain the slope k of the output voltage ripplev。
In the embodiment, the slope of the output voltage is calculated by adopting a digital signal processing mode. When a digital signal processing mode is adopted, the collected historical voltage ripple signals are stored in a discretization mode, so that the slope calculation of the output voltage signals can be realized through differential calculation. The calculation formula of the voltage ripple slope is as follows:
Figure GDA0003515147530000061
wherein k isv[n]Is the slope of the output voltage at the nth sampling point, Uout[n]For the nth output voltage sample, Δ t is the sample time interval.
S202: introducing voltage ripple slope index coefficient KvAnd calculating the historical switching period and duty ratio of the control power supply.
Convenient areaThe time length of different states of the switch tube and the subsequent logic judgment of the fault condition of the switch tube are divided, and a voltage ripple slope mark coefficient K is introducedvThe values are as follows:
Figure GDA0003515147530000062
it will be understood by those skilled in the art that when K is usedvWhen the value is 1, the switch tube is in a closed state; when K isvWhen the value is 0, the switch tube is in an off state.
As shown in FIG. 2, the output voltage waveform of the single-ended forward circuit with four switching periods is given, and the first three switching periods are assumed to be historical switching periods, namely, switching period T4Is the current switching cycle. T is3Switching period T of the time segmentsThe duty ratio D calculation method comprises the following steps: will switch for a period T3Time period KvThe time point of the rising edge of the waveform is recorded as t1The time point of the next falling edge is denoted as t2Then, the time point of the next rising edge is recorded as t3Then the control supply is at T3Switching period T of time segmentsThe duty ratio D can be calculated by the following equation:
Ts＝t3-t1 (3)
Figure GDA0003515147530000063
because the output voltage of the voltage-stabilizing control power supply is constant, the switching period and the duty ratio of the voltage-stabilizing control power supply are basically kept unchanged, the switching period T of the control power supply can be indirectly obtained through the calculationsAnd a duty cycle D.
Preferably, T may be first introduced1、T2、T3The switching period and duty ratio of three time periods are estimated, and the average value of all the switching periods and duty ratios is taken as the switching period T of the control power supplysAnd duty ratio D to improve the switching period of the control power supplyAnd the accuracy of the duty cycle estimation.
S203: the switching pulse of the current switching cycle is predicted.
Switching period T of control power supply by formulas (3) and (4)sWith the estimation of the duty cycle D, the current switching period T can be predicted4The switching pulse of (2):
Figure GDA0003515147530000071
wherein
Figure GDA0003515147530000072
For switching pulses during a switching period T4The value of (1) represents high level, and the value of (0) represents low level.
Preferably, the step S200 may further include:
s204: fig. 5 is a schematic diagram for preliminarily determining a fault condition of a switching tube according to obtained historical information of a control power supply, which is provided by an embodiment of the present invention, and specifically includes: when the switch period T4 is detected, the closing time of the switch tube is longer than the historical switch period TsIf so, judging that the switching tube has a short-circuit fault, and sending a short-circuit fault alarm; when the switch period T4 is detected, the switch tube disconnection duration is longer than the historical switch period TsAnd if so, judging that the switching tube has an open circuit fault and giving an open circuit fault alarm. To find a failure, step S300 is performed.
Fig. 6 is a processing flow chart for determining whether a switching tube is faulty and a fault type according to predicted switching pulses and voltage ripple data actually collected in a current switching period, where as shown in fig. 6, step S300 includes the following steps:
s301: and detecting the voltage ripple slope according to the predicted switching pulse in the current switching period.
In the switching period T4And (4) respectively acquiring voltage ripple data in a T4 period in real time when a switching tube is closed and opened according to the switching pulse predicted by the formula (5), and calculating a voltage ripple slope index coefficient KvThe value of (c). CollectingThe method is the same as historical voltage ripple collection, and the ripple data is obtained through collecting by a voltage sensor or a sampling circuit and passing through a blocking circuit and an amplifier.
Preferably, in step S301, the predicted switching pulse edge detection voltage ripple slope flag coefficient K should be avoidedvTo avoid errors in the voltage slope detection during switching of the tube state. As shown in fig. 6, when
Figure GDA0003515147530000073
When 1, the detection time period is selected as (t)3+0.25DTs，t3+0.75DTs) (ii) a When in use
Figure GDA0003515147530000074
When the time is 0, the detection time period is selected as (t)3+0.75DTs+0.25Ts，t3+0.25DTs+0.75Ts)。
S302: in the current switching period, according to the predicted switching pulse and the slope index coefficient K obtained by detectionvAnd carrying out fault logic judgment to complete fault detection and corresponding fault alarm of the switching tube.
FIG. 7 shows an optimized switching period T provided by an embodiment of the present invention4In accordance with
Figure GDA0003515147530000081
And KvThe value of (2) is used for judging whether the switching tube has a fault of open circuit or short circuit or not and whether the switching tube has no fault. As shown in fig. 7, during the switching period T4In accordance with
Figure GDA0003515147530000082
And KvThe value of (2) completes the fault judgment of the switching tube, and the fault type and the judgment logic are as follows:
firstly, when
Figure GDA0003515147530000083
Has a value of 1 and KvWhen the value of the voltage is 1, the switching tube has no open circuit fault and does not send out an alarm;
② when
Figure GDA0003515147530000084
Has a value of 1 and KvWhen the value of the voltage is 0, the switching tube has an open circuit fault, and an open circuit fault alarm is sent out;
③ when
Figure GDA0003515147530000085
Has a value of 0 and KvWhen the value of the voltage is 1, the switching tube has a short-circuit fault at the moment, and a short-circuit fault alarm is sent out;
fourthly when
Figure GDA0003515147530000086
Has a value of 0 and KvWhen the value of (1) is 0, the switching tube has no short-circuit fault and does not give an alarm.
Fig. 8 is a flowchart of a process for determining whether a switching tube fails or fails for a short time according to a predicted switching pulse and voltage ripple data actually collected in a current switching period according to an embodiment of the present invention, as shown in fig. 8, preferably, step 300 includes, in addition to steps S301 and S302 above, further:
s303: and judging whether the fault of the switching tube is a short-time fault or not.
FIG. 9 shows an embodiment of the present invention, wherein the switching period T is set4In accordance with
Figure GDA0003515147530000087
And KvThe value of (2) is used for judging whether the fault of the switching tube is a short-time fault schematic diagram. As shown in fig. 9, the switching period T is detected4After the switch tube is in fault, continuing to predict T5、T6The switching pulses of the switching cycle are waited, and the steps S301 and S302 are repeated to determine whether the fault still exists in the switching cycle. If the fault is eliminated in the switching period, the switching tube has a short-time fault, the fault type is recorded, and a short-time fault alarm is sent out; if the fault still exists in one or more switching cycles later, the switching tube has a permanent fault, the fault type is recorded and a permanent fault is sent outAnd (4) a barrier alarm.
In summary, the method of the embodiment of the invention adopts a mode of predicting the switching pulse, realizes the fault early warning of the switching tube under the condition of not invading and controlling the interior of the power supply equipment, has small influence on the power supply system and has strong practicability; the output voltage detection mode is adopted, so that the signal acquisition amount is small, and the realization is convenient; by adopting the method, the fault can be detected in a switching period after the switching tube is in fault, and the fault detection efficiency is high.
The embodiment of the invention provides short-time and permanent fault alarms, and can perform early warning through the short-time fault alarms when the service life of the power supply equipment is close to the service life, so that the reliability of the power supply equipment is improved.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. A fault early warning method for a control power supply system is characterized by comprising the following steps:
collecting and controlling output voltage ripple data of a power supply system;
analyzing the collected historical voltage ripple data and predicting switching pulses in the current switching period;
judging whether a switching tube of the control power supply system fails or not according to the predicted switching pulse of the current switching period and the voltage ripple data actually acquired by the current switching period, and determining the type of the failure;
analyzing the collected historical voltage ripple data and predicting the switching pulse in the current switching period, wherein the method comprises the following steps:
s201: calculating the slope of the collected historical voltage ripple data to obtain the slope k of the output voltage ripplev；
Figure FDA0003515147520000011
Wherein k isv[n]Is the slope of the output voltage at the nth sampling point, Uout[n]Is the nth output voltage sampling value, and delta t is the sampling time interval;
s202: calculating voltage ripple slope mark coefficient Kv：
Figure FDA0003515147520000012
When K isvWhen the value is 1, the switch tube is in a closed state; when K isvWhen the value is 0, the switching tube is in a disconnected state;
setting the first three switching periods T1、T2And T3For historical switching periods, switching period T4For the current switching period, the switching period T is set3Time period KvThe time point of the rising edge of the waveform is recorded as t1At a time point t1Is recorded as t at the time point of the next falling edge2At a time point t2Is recorded as t at the next rising edge time point3Controlling the power supply at T3Switching period T of time segmentsThe calculation formula with the duty ratio D is as follows:
Ts＝t3-t1
Figure FDA0003515147520000013
s203: predicting the current switching period T4The switching pulse of (2):
Figure FDA0003515147520000014
wherein
Figure FDA0003515147520000015
For switching pulses during a switching period T4The value of (1) represents high level, and the value of (0) represents low level.
2. The method of claim 1, wherein the collecting output voltage ripple data of the control power supply system comprises:
the output voltage of the power supply system is collected and controlled through the voltage sensor, and voltage ripple data are obtained after the output voltage passes through the blocking circuit and the amplifier.
3. The method of claim 1, further comprising: when the switching period T is detected4The closing time of the switch tube is longer than the historical switch period TsIf so, judging that the switching tube has a short-circuit fault, and sending a short-circuit fault alarm; when the switching period T is detected4The switching tube disconnection duration is longer than the historical switching period TsThen judging the switch tubeWhen the open circuit fault occurs, an open circuit fault alarm is sent out.
4. The method according to claim 1 or 3, wherein the determining whether the switching tube has a fault according to the predicted switching pulse of the current switching cycle and the actually collected voltage ripple data of the current switching cycle and determining the fault type comprises:
s301: in the current switching period T4And according to the predicted switching pulse, respectively collecting voltage ripple data in real time when the switching tube is switched on and switched off, and calculating a voltage ripple slope index coefficient KvA value of (d);
s302: in the current switching period, according to the predicted switching pulse and the slope index coefficient K obtained by detectionvThe logic of the fault is judged and,
firstly, when
Figure FDA0003515147520000021
Has a value of 1 and KvWhen the value of the voltage is 1, judging that the switching tube has no open circuit fault, and not giving out an alarm;
② when
Figure FDA0003515147520000022
Has a value of 1 and KvWhen the value of the voltage is 0, judging that the switching tube has an open circuit fault, and sending out an open circuit fault alarm;
③ when
Figure FDA0003515147520000023
Has a value of 0 and KvWhen the value of the voltage is 1, judging that the switching tube has a short-circuit fault, and sending a short-circuit fault alarm;
fourthly when
Figure FDA0003515147520000024
Has a value of 0 and KvWhen the value of (1) is 0, judging that the switch tube has no short-circuit fault, and not giving out an alarm.
5. The method of claim 4, further comprising:
detecting the switching period T4After the inner switching tube breaks down, continuing to predict switching pulses of a subsequent switching period, judging whether the fault still exists in the subsequent switching period, if the fault in the subsequent switching period is eliminated, judging that the switching tube breaks down in a short time, recording the fault type and sending a short-time fault alarm; if the fault still exists in the subsequent switching period, the switching tube is judged to have a permanent fault, the fault type is recorded, and a permanent fault alarm is sent out.
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