CN219456394U - Abnormal detection system for aging test of mass-production electronic control PCBA - Google Patents
Abnormal detection system for aging test of mass-production electronic control PCBA Download PDFInfo
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Abstract
The utility model relates to an aging test abnormality detection system of a mass production electronic control PCBA, wherein an industrial control unit comprises a programmable power supply, a relay channel switch unit and an ammeter, a plurality of aging test frames are arranged in an aging test room, and each aging test frame is provided with a plurality of aging test boxes; the industrial control computer is connected with a plurality of programmable power supplies through a signal control bus to control and output specific direct-current voltage and current, is connected with an ammeter to acquire the current value of a channel in real time, is connected with a temperature control unit and a humidity control unit to issue a temperature and humidity control instruction and acquire temperature and humidity measured values in real time, and the temperature control unit is connected with a heating electric heater and a temperature sensor group in the aging test room to control the temperature change in the aging test room; the industrial control unit is connected with the aging test box, and is used for supplying power to the PCBA to be tested and monitoring the PCBA in real time. The efficiency of the test is greatly improved.
Description
Technical Field
The utility model relates to a mass production electronic control PCBA aging test abnormality detection system.
Background
At present, the industrial Internet rapidly develops in recent years, various digital automatic factories are applied endlessly, and various digital and automatic applications are also appeared. Burn-in (burn-in) testing is a method in which a batch of devices under test are screened for early failure individuals before they are put into actual use by a customer.
The PCBA (Printed Circuit Board Assembly) aging test used on the production line comprises temperature circulation or humidity circulation according to specific requirements, wherein one test mode is that an aged product is placed in an aging room to be subjected to high-low temperature and high-low humidity reliability test under the condition of no power-on, and the other test mode is placed in the aging room to be subjected to aging test under the condition of power-on, and various functional tests are usually carried out after the two test modes are finished, and the PCBA product with problems is screened.
In the prior art, the problem is encountered when the PCBA is subjected to power-on aging test in a factory in large-scale mass production, and because the PCBA function test machines are small in number and high in price, each PCBA cannot be independently placed into the function test machine to be subjected to online aging test in mass production, a group of a plurality of PCBA to be tested needs to be placed into a specific aging test room, and after a temperature and humidity circulation control flow is set, the aging test is performed. On one hand, overheat, short circuit and other failures can occur during the aging test, so that the PCBA to be tested is mutually influenced to cause associated loss, and EHS (Environment, health, safety) accidents are extremely easy to occur; on the other hand, due to misoperation of production line staff, including but not limited to abnormal conditions such as incorrect insertion quantity of PCBA, inadequately spliced connection interfaces and the like, the aging test is abnormal, the result is unreliable, the aging test efficiency is affected, and the prior art and the system cannot meet the actual aging test requirement of the mass production PCBA.
In summary, it is necessary to design a mass production PCBA aging test system, which can determine whether the measured PCBA is abnormal and can give an alarm in time in real time according to different PCBA test types, and can improve the aging test efficiency under the conditions of small data and unsupervised status, i.e. without manual setting of various thresholds and human intervention.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a mass production electronic control PCBA aging test abnormality detection system.
The aim of the utility model is achieved by the following technical scheme:
the mass production electronic control PCBA aging test abnormality detection system is characterized in that: the device comprises a display terminal, an industrial control unit and an aging test room, wherein the industrial control unit comprises a programmable power supply, a relay channel switch unit, an ammeter, a temperature control unit, a humidity control unit and an industrial control computer, a plurality of aging test frames are arranged in the aging test room, and each aging test frame is provided with a plurality of aging test boxes for being filled with PCBA to be tested; the industrial control computer is connected with a plurality of programmable power supplies through a signal control bus to control and output specific direct-current voltage and current, is connected with an ammeter to acquire the current value of a channel in real time, is connected with a temperature control unit and a humidity control unit to issue a temperature and humidity control instruction and acquire temperature and humidity measured values in real time, and the temperature control unit is connected with a heating electric heater and a temperature sensor group in the aging test room to control the temperature change in the aging test room; the industrial control unit is connected with an aging test box in the aging test room, and is used for supplying power to the PCBA to be tested and monitoring the PCBA in real time.
Further, the aging test anomaly detection system for the mass production electronic control PCBA comprises a test base plate and a base plate connection clamping groove, the PCBA to be tested is connected with the test base plate through the base plate connection clamping groove, and the test base plate supplies power for the PCBA to be tested.
Further, the industrial control computer is connected with the programmable power supply, the relay channel switch unit, the ammeter, the temperature control unit and the humidity control unit through signal control buses respectively, the programmable power supply is connected with the relay channel switch unit through a power supply line, the relay channel switch unit controls power output, the relay channel switch unit is connected with the ammeter through the power supply line, current data are acquired in real time, the aging test box is connected through the power supply line, the current data of power supply are acquired in real time through switching current voltage output, and safe operation and data acquisition of the aging test are realized.
Further, the mass production electronic control PCBA aging test abnormality detection system comprises a temperature control unit of the industrial control unit, a temperature sensor group and a humidity control unit, wherein the temperature control unit is connected with a heating electric heater and the temperature sensor group in an aging test room through a signal control bus, and the humidity control unit is connected with a humidifier and the humidity sensor group in the aging test room through the signal control bus; the industrial control unit is connected with an aging test box in the aging test room through a power supply line.
Further, the mass production electronic control PCBA aging test abnormality detection system is characterized in that the signal control bus is a Modbus bus based on RS485 or a deviceNet bus based on a network.
Further, the mass production electronic control PCBA aging test abnormality detection system is characterized in that the power supply line is a double-core shielding power line.
Compared with the prior art, the utility model has remarkable advantages and beneficial effects, and is specifically embodied in the following aspects:
(1) according to the utility model, various control hardware and sensors are integrated, so that the whole flow digital management of the aging test of the mass production PCBA is realized, the traceability of the test process is improved, and the production efficiency of the test is improved;
(2) the hardware structure is simple and the universality is strong; the aging test system provides power supply and collects corresponding voltage and current data, and is compatible with mass aging tests of PCBA of different types by replacing a test bottom plate in an aging box, so that subsequent development investment is reduced; the hardware investment cost is not required to be additionally increased, the function test equipment module is increased to finish the aging abnormality detection, the occurrence probability of EHS accidents is reduced by predictive alarm, meanwhile, the invalid test caused by misoperation such as incomplete plugging or missed plugging of staff can be timely found, and the test efficiency is improved;
(3) the aging test method is used for managing the whole flow of the aging test process of the mass production PCBA, detecting the test abnormality in real time, achieving the expectation of the predictive alarm of the aging test abnormality, effectively reducing the loss of a factory and improving the efficiency of the aging test; meanwhile, the PCBA production test system is in butt joint with a factory MES system, so that full-flow digital management of PCBA production test is realized.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1: the structure of the detection system is schematically shown;
fig. 2: the structure of the industrial control unit is schematically shown;
fig. 3: a structural schematic diagram of the aging test box;
fig. 4: a detection flow diagram;
fig. 5: training an aging anomaly detection variation self-encoder model schematic based on the current data;
fig. 6: schematic of an improved VAE model based on time series.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present utility model, directional terms, order terms, etc. are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 3, the aging test abnormality detection system for the mass production electronic control PCBA comprises a display terminal 1, an industrial control unit 2 and an aging test room 3, wherein the industrial control unit 2 comprises a programmable power supply 21, a relay channel switch unit 22, an ammeter 23, a temperature control unit 24, a humidity control unit 25 and an industrial control computer 26, a plurality of aging test frames 32 are arranged in the aging test room 3, and each aging test frame is provided with a plurality of aging test boxes 31 for loading PCBA to be tested; the industrial control computer 26 is connected with a plurality of programmable power supplies 21 through a signal control bus 27, controls and outputs specific direct-current voltage and current, is connected with an ammeter 23 to acquire the current value of a channel in real time, is connected with a temperature control unit 24 and a humidity control unit 25, issues a temperature and humidity control instruction and acquires a temperature and humidity measured value in real time, the temperature control unit 24 of the industrial control unit 2 is connected with a heating electric heater and a temperature sensor group in the aging test room 3 through the signal control bus 27, and is used for controlling the temperature change in the aging test room 3 in a closed-loop manner through a PID algorithm, and the humidity control unit 25 is connected with a humidifier and a humidity sensor group in the aging test room through the signal control bus 27 and is used for controlling the humidity change in the aging test room 3 in a closed-loop manner through the PID algorithm; the industrial control unit 2 is connected with an aging test box in the aging test room through a power supply line 28, and the industrial control unit 2 is connected to the aging test box by leading out a direct current power supply line group, and supplies power to the PCBA to be tested and monitors the PCBA in real time.
The burn-in test box 31 includes a test base 311 and a base connection slot 313, and the PCBA312 to be tested is connected to the test base 311 through the base connection slot 313, and the test base 311 supplies power to the PCBA312 to be tested.
The industrial control computer 26 is respectively connected with the programmable power source 21, the relay channel switch unit 22, the ammeter 23, the temperature control unit 24 and the humidity control unit 25 through the signal control bus 27, the programmable power source 21 is connected with the relay channel switch unit 22 through the power supply line 28, the power supply output is controlled through the relay channel switch unit 22, the relay channel switch unit 22 is connected with the ammeter 23 through the power supply line 28, current data are acquired in real time, the aging test box 31 is connected through the power supply line 28, the current data of power supply are acquired in real time through switching the current voltage output, and the safe operation and data acquisition of the aging test are realized. The signal control bus 27 is an RS485 based modbus or a network based deviceNet bus. The power supply line 28 is a two-cored shielded power line.
The display terminal 1 includes a display with a touch screen, a keyboard, and a mouse; the aging test room framework is formed by combining heat preservation warehouse plate compartments, and is provided with a heating electric heater, a humidifier, a tray frame, a sliding door, a circulating fan, an exhaust fan and the like, so that a high-temperature and severe environment is simulated, and a product is connected with a simulated load in the environment to perform power-on operation; the aging test box is used for loading PCBA to be tested and providing power supply and load; the aging test rack is used for installing an aging test box, and the bottom of the aging test box is provided with a specific roller device, so that the aging test box is conveniently transported into an aging test room after being filled with a group of roller devices. The industrial control unit is in communication connection with each unit in the aging test room 3 through a signal control bus 27, and supplies power to each aging test box 31 on the aging test rack 32 through a power supply line 28.
The programmable power supply 21 is a direct current programmable power supply, such as DP3000 of common source electricity; the relay channel switch unit 22 is a relay control module group, such as QJ-32RG-T1Z-24V of the celebration electron; ammeter such as DW-81-B/C of Chuanghong instrument; the temperature control unit 24 has PID feedback control, such as AT900-R-A1-RS-P2 for the Chuanghong instrument; the humidity control unit 25 has PID feedback control such as WHD46 of An Kerui electric company, inc; the industrial control computer 26 is a general purpose computer having multiple serial ports and network ports, such as IBOX-105V2-2L4C, which is an Tuo industrial control.
The base plates in different aging test boxes can be replaced according to different PCBA test board types, due to the fixity of temperature and humidity circulation flow in the aging test, the current and other data supplied to the aging test boxes by an industrial control unit are collected in real time, and under the conditions of small data and unsupervised state, namely without manual intervention of various thresholds, the PCBA test board type in the aging test is calculated in real time by adopting a deep learning algorithm, whether test abnormality exists in the PCBA test boxes in the aging test is analyzed, predictive alarm is provided for mass aging test, and if the test abnormality exists, the power supply of the corresponding aging test box is timely cut off, so that the loss is reduced; and the error of staff operation is also likely, and the PCBA is not inserted or inserted in place, so that the current is abnormal based on the data of the time sequence, and therefore predictive alarm is sent out in real time, correction is made in time, and the overall aging test efficiency is improved.
The mass production electronic control PCBA aging test abnormality detection flow comprises the following specific steps as shown in fig. 4:
(1) Correspondingly connecting the aging test box with the industrial control unit, and scanning the two-dimensional code of the PCBA surface to be tested and the two-dimensional code of the aging test box through a code scanning gun so as to bind the two-dimensional code with the corresponding aging test box;
electrifying and performing aging test according to a set flow, sampling the current data of each aging test box by an ammeter of an industrial control unit at equal intervals for 1 s-10 s, and continuously sampling a complete aging test period for 24-120 hours;
placing all PCBA subjected to test into an FT function tester to pass the test, and taking the time series data as a group of normal vector data after no abnormality exists;
(2) Carrying out averaging treatment on the collected current data according to the number of PCBA blocks in each aging test box, namely dividing the total current detected by each aging test box by the number of PCBA blocks in the test box;
initializing time sequence data, performing average processing once every 5s at 1s sampling interval period, taking every 10 minutes as a time window, wherein each time window has 120 acquired and average processed current data, and forming 120-dimensional vectors as time sequence data of a window;
10 test frames can be placed in the aging test room, 6 test boxes are placed in each test frame, 60 groups of long-time sequence data can be obtained through full-load one-time aging test, after the PCBA passes the aging test, the PCBA has regularity based on the time sequence current data, and the plurality of groups of data are sliced according to the same time window of every 10 minutes to be used as data input of a VAE model;
(3) Building a VAE model, as in fig. 5, the VAE model contains an encoder and a decoder, X 1 、X 2 、X 3 ...X n Carrying out mean variance calculation on real vector data input from the outside to obtain the mean value and variance of different normal distribution models, carrying out heavy parameter calculation to enable hidden variable Z to obey normal distribution N (0,I), and obtaining the hidden variable Z after sampling 1 、Z 2 、Z 3 ...Z n After passing through the decoder, the generated reconstruction data X 'is obtained' 1 、X′ 2 、X′ 3 ...X′ n By constructing an encoder and a decoder by minimizing a loss function +.:
￡＝E x～p(x) [Ez～p(z|x)[-lnq(x|z)+KL(P(z|x)||q(z))]formula (1)
E x～p(x) [f(x)]Representing the expectation of f (x), wherein the distribution of x is p (x);
KL (p (x) ||q (x)) represents the KL divergence of the two distributions;
-a sign representing a loss function;
constructing an improved VAE model based on time sequence data, as shown in fig. 6, an original time window input model, adopting a VAE encoder to encode to obtain a low-dimensional hidden variable vector set, embedding the hidden variable vector set into an LSTM (least squares) for predicting the embedded input of the next window, predicting embedded output after the LSTM model operation, and then adopting a VAE decoder to decode to obtain a reconstructed time sequence data window, wherein the prediction error of the reconstructed time sequence data is used as an abnormality judgment standard;
the description is as follows: taking the local window of p continuous readings as input, estimating a q-dimensional low-dimensional embedded by an encoder, and reconstructing an original window by a decoder; generating a rolling window from the training data for training the VAE model; w (w) t ＝[x t-p+1 ，...，x t ]The window is ended at a time sequence window t, the continuous reading p is 120, the range is 60-180D, the dimension q of the hidden variable output by the encoder is 20D, and the range is 10-30D;
introducing LSTM (Long Short-Term Memory) cyclic neural network model to process time series data, using W t ＝[w t-(k-1)*p ，w t-(k-2)*p ，...，w t ]Representing the time sequence, performing embedded operation on the VAE of the k non-overlapping window sequences through a VAE encoder;represents W t The corresponding embedded input after conversion by the VAE encoder uses aging test normal time sequence data to update and optimize the parameters of the VAE model by minimizing the loss function, namely formula (1), and a random gradient descent optimization algorithm, and after optimizing the VAE model, the encoder from the trained VAE model is used to estimate all embedded sequences E in the training dataset t The method comprises the steps of carrying out a first treatment on the surface of the To train the LSTM model, the LSTM model takes the sequence E t Is embedded in k-1, and predicts the next embedded, i.e.:
an embedded input representing a k-1 th window of the time series window;
representing time series windowsThe kth embedded output of the port predicted by the LSTM model;
LSTM represents a recurrent neural network module;
the LSTM model algorithm can directly call the keras.1ayers.LSTM in the open source module keras;
optimizing LSTM model parameters by minimizing embedded prediction errors, i.e
Generating a working model based on an aging test data set by adopting python programming on the deep learning workstation according to the method, and outputting a layered data format file HDF5 after training is finished;
(4) Converting the model generated on the deep learning workstation into a model based on a C/C++ file, generating the model by using a third party tool or manual rewriting, such as h dump, hDFview, h5cc/h5c++, and compiling and linking an abnormality detection model into an aging detection control system;
(5) Deploying an aging test abnormality detection model on an industrial computer for operation, collecting current data based on a time sequence in real time, converting the current data by a VAE encoder, and reconstructing hidden variables of the VAE corresponding to the LSTM prediction next window by adopting trained VAE according to the hidden variables;
the kth embedded output of the time sequence window predicted by the LSTM model is represented;
representing the reconstructed time series;
the Decoder means a VAE Decoder;
for the reconstructed window, a function R is defined t By calculating w t Predicting error to evaluate whether the test is abnormal;
w t-(k-i)*p representing an original input time sequence;
representing the reconstructed time series;
R t representing a prediction error;
setting a threshold value, calculating according to the formula (4), and if the result is larger than the set threshold value, determining that the aging abnormality occurs, and after the aging test time window is finished, making a predictive alarm.
In conclusion, the utility model integrates various control hardware and sensors, realizes the whole-flow digital management of the aging test of the mass production PCBA, increases the traceability of the test process, and improves the production efficiency of the test.
The hardware structure is simple and the universality is strong; the aging test system provides power supply and collects corresponding voltage and current data, and is compatible with mass aging tests of PCBA of different types by replacing a test bottom plate in an aging box, so that subsequent development investment is reduced; the method has the advantages that the hardware investment cost is not required to be additionally increased, the function test equipment module is increased to finish the aging abnormality detection, the occurrence probability of EHS accidents is reduced due to predictive alarm, meanwhile, test invalidity caused by misoperation such as incomplete plugging or missed plugging of staff can be timely found, and the test efficiency is improved.
The aging test method is used for managing the whole flow of the aging test process of the mass production PCBA, detecting the test abnormality in real time, achieving the expectation of the predictive alarm of the aging test abnormality, effectively reducing the loss of a factory and improving the efficiency of the aging test; meanwhile, the PCBA production test system is in butt joint with a factory MES system, so that full-flow digital management of PCBA production test is realized.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present utility model.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (6)
1. Automatic control PCBA aging test anomaly detection system of volume production, its characterized in that: the device comprises a display terminal (1), an industrial control unit (2) and an aging test room (3), wherein the industrial control unit (2) comprises a programmable power supply (21), a relay channel switch unit (22), an ammeter (23), a temperature control unit (24), a humidity control unit (25) and an industrial control computer (26), a plurality of aging test frames (32) are arranged in the aging test room (3), and each aging test frame is provided with a plurality of aging test boxes (31) for loading PCBA to be tested; the industrial control computer (26) is connected with a plurality of programmable power supplies (21) through a signal control bus (27) to control and output specific direct-current voltage and current, is connected with the ammeter (23) to acquire the current value of a channel in real time, is connected with the temperature control unit (24) and the humidity control unit (25), issues a temperature and humidity control instruction and acquires the temperature and humidity measured value in real time, the temperature control unit (24) is connected with a heating electric heater and a temperature sensor group in the aging test room (3) to control the temperature change in the aging test room (3), and the humidity control unit (25) is connected with a humidifier and a humidity sensor group in the aging test room (3) to control the humidity change in the aging test room (3); the industrial control unit (2) is connected with an aging test box in the aging test room, and is used for supplying power to the PCBA to be tested and monitoring the PCBA in real time.
2. The mass production electronically controlled PCBA burn-in anomaly detection system of claim 1, wherein: the aging test box (31) comprises a test base plate (311) and a base plate connection clamping groove (313), the PCBA (312) to be tested is connected with the test base plate (311) through the base plate connection clamping groove (313), and the test base plate (311) supplies power for the PCBA (312) to be tested.
3. The mass production electronically controlled PCBA burn-in anomaly detection system of claim 1, wherein: the industrial control computer (26) is connected with the programmable power supply (21), the relay channel switch unit (22), the ammeter (23), the temperature control unit (24) and the humidity control unit (25) through the signal control bus (27), the programmable power supply (21) is connected with the relay channel switch unit (22) through the power supply line (28), the relay channel switch unit (22) is connected with the ammeter (23) through the power supply line (28), current data are acquired in real time, the ageing test box (31) is connected through the power supply line (28), and the current data of power supply are acquired in real time through switching the current voltage output.
4. The mass production electronically controlled PCBA burn-in anomaly detection system of claim 1, wherein: the temperature control unit (24) of the industrial control unit (2) is connected with a heating electric heater and a temperature sensor group in the aging test room through a signal control bus (27), and the humidity control unit (25) is connected with a humidifier and a humidity sensor group in the aging test room through the signal control bus (27); the industrial control unit is connected with an aging test box in the aging test room through a power supply line (28).
5. The mass production electronically controlled PCBA burn-in anomaly detection system of claim 1 or 3 or 4, wherein: the signal control bus (27) is a modbus bus based on RS485 or a deviceNet bus based on a network.
6. The mass production electronically controlled PCBA burn-in anomaly detection system of claim 1 or 3 or 4, wherein: the power supply line (28) is a double-core shielded power line.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117647725A (en) * | 2024-01-29 | 2024-03-05 | 深圳维盛半导体科技有限公司 | Aging test method and system for PCBA |
| CN117849653A (en) * | 2024-03-08 | 2024-04-09 | 备倍电科技(深圳)有限公司 | Working state monitoring method and system based on power management |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117647725A (en) * | 2024-01-29 | 2024-03-05 | 深圳维盛半导体科技有限公司 | Aging test method and system for PCBA |
| CN117647725B (en) * | 2024-01-29 | 2024-04-02 | 深圳维盛半导体科技有限公司 | Aging test method and system for PCBA |
| CN117849653A (en) * | 2024-03-08 | 2024-04-09 | 备倍电科技(深圳)有限公司 | Working state monitoring method and system based on power management |
| CN117849653B (en) * | 2024-03-08 | 2024-05-07 | 备倍电科技(深圳)有限公司 | Working state monitoring method and system based on power management |
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