CN203275534U - Device for degradation determination of power supply power module - Google Patents

Abstract

The utility model discloses a device for degradation determination of a power supply power module. The device comprises a power module, a signal acquisition unit, a signal processing unit, and a caution unit. The power module is provided with an input end, an output end, and a drive end. The signal acquisition unit is connected with the output end and the drive end of the power module, and is used to acquire output signals of the output end of the power module and driving signals of the drive end. The signal processing unit performs Volterra series time domain core identification analysis according to the driving signals of the drive end and the output signals of the output end, and the signal processing unit controls whether the caution unit sends out caution information according to analysis results. Since the device determines degradation condition of the power module according to the output signals of the output end and the driving signals of the drive end, the device does not need extrinsic motivation and uses self signals to determine the degradation condition of the power module, thereby improving reliability and accuracy of degradation condition determination of the power module.

Description

A kind of power module degradation determination device

Technical field

The utility model relates to the monitoring technique of power module, is specifically related to the online determination methods of a kind of DC/DC power module deterioration state and device.

Background technology

Highly reliable embedded system is widely used in the complication system of direct relation national strategy safety, energy security and the national economic development such as satellite, spacecraft, nuclear power station, naval vessel, bullet train, and the DC/DC power supply is the key equipment that guarantees its reliability service.But the Special use environment often causes the DC/DC power-fail to cause system out of control, loses huge.According to incompletely statistics, approximately 34% electronic system fault is all that the inefficacy that the tired use of power-supply system components and parts or environmental stress variation cause causes.External environmental factor (as high pressure transient state environment, wide temperature range cataclysm, vibration, impact, electromagnetic radiation, integral dose radiation and single event etc.) and operation internal factor (as surge voltage, electric current, load changing etc.), often cause the key modules state parameter of power-supply system to degenerate, cause the circuit working degradation, cause the parameter fault.

Power model and electrochemical capacitor are the highest devices of crash rate in power supply.Power-fail is mainly because these two link deterioration failures cause.Wherein, the leaded multilayer ceramic capacitor of the low crash rate of electrochemical capacitor existing many units employing substitutes, and has improved the reliability of power supply.Yet the inefficacy of power model research at present still concentrates on physical failure mechanism, failure model, and the dynamic behaviour process that is deteriorated to inefficacy for power model in service is also not fully aware of.Therefore, how to judge that the deterioration state of power model becomes the important technology problem of this area.

The utility model content

The purpose of this utility model is to provide a kind of power module degradation determination device, and this device can improve the reliability of judgement power model deterioration state.

For achieving the above object, the utility model provides a kind of power module deteriorated disconnected device, comprising: power model, signal gathering unit, signal processing unit and caution unit, this power model has input end, output terminal and drive end.Signal gathering unit is connected with drive end with the output terminal of power model, for the output signal of the output terminal that gathers power model and the driving signal of drive end.This signal processing unit carries out the identification of Volterra progression time domain core according to the output signal of the driving signal of drive end and output terminal to be analyzed, and this signal processing unit is controlled the caution unit according to analysis result and whether sent information warning.

As further improvement, this device also comprises:

One first filter unit, it is connected with the input end of power model, is used for power input module after alternating current large-power power supply shaping filter; And

One second filter unit, it is connected with the output terminal of power model, is used for the output signal of power model is carried out output linearity DC high-power power supply after shaping filter.

As further improvement, this device also comprises: a PWM unit, it is connected respectively drive end and is connected with power model with the second filter unit, be used for the output signal according to the output signal power ratio control module of the second filter unit.

Due to, the output signal of the output terminal of the utility model device collection power model and the driving signal of drive end, judge the deterioration state of this power model with the driving signal of the output signal of output terminal and drive end, therefore the utility model device does not need extrinsic motivated but utilizes self signal that the deterioration state of power model is judged, thereby improves reliability and the accuracy of the judgement of power model deterioration state.

Description of drawings

Fig. 1 is the block scheme of the utility model power module degradation determination device one specific embodiment.

Fig. 2 is the circuit diagram of the power model of power module degradation determination device shown in Figure 1.

Fig. 3 is the process flow diagram of the online determination methods of the utility model power module deterioration state.

Embodiment

In order to describe technology contents of the present utility model, the purpose of reaching and effect in detail, below in conjunction with specific embodiment and coordinate accompanying drawing, the technical solution of the utility model is clearly and completely described.

See also Fig. 1, it discloses a specific embodiment of the deteriorated disconnected device of the utility model power module.In the present embodiment, this device comprises power model 100, the first filter unit 200, the second filter unit 300, PWM unit 400, signal gathering unit 500, signal processing unit 600 and caution unit 700.Wherein, power model 100 is by inductance L _g, capacitor C _ds, C _gd, C _gs, conducting resistance R _on, resistance R _g, the electronic components such as diode D and triode Q form, this power model 100 has input end 110, output terminal 120 and drive end 130, as shown in Figure 2.

The first filter unit 200 is connected with the input end 110 of power model 100, is used for power input module 100 after alternating current large-power power supply shaping filter.The second filter unit 300 is connected with the output terminal 120 of power model 100, is used for the output signal of power model 100 is carried out output linearity DC high-power power supply after shaping filter.PWM unit 400 is connected with the drive end 130 that the second filter unit 300 is connected with power model respectively, PWM unit 400 produces pulse-width signal according to the output signal of the second filter unit 300, the conducting of the triode Q of this pulse-width signal power ratio control module 100 and closing, thus realize predetermined power stage.

Signal gathering unit 500 is connected with drive end with the output terminal 120 of power model 100 and is connected, and is used for gathering the output signal of output terminal 120 of power model 100 and the driving signal of drive end 130.Signal processing unit 600 is processed output signal and the driving signal of the power model 100 of collection.Signal processing unit 600 bases are warned unit 700 with control and whether are sent information warning the output signal of power model 100 and the deterioration state of the result judgement power model 100 that drives signal.

See also Fig. 3, the idiographic flow of the online determination methods of the utility model power module deterioration state.The method is:

S1, the drive end 130 of power model 100 is loading or is cancelling when driving signal, gathers the output signal of output terminal 120 of this power model 100 and the driving signal of drive end 130;

S2 sets up the Volterra Model in Time Domain of the output signal of output terminal 120 according to the driving signal of this drive end 130, and calculates the time domain core value of this Volterra Model in Time Domain; And

S2 compares time domain core value and the normal value of being scheduled to, and judges the deterioration state of this power model 100 according to comparative result.

In the present embodiment, output signal by obtaining this output terminal 120 and the driving signal of drive end 130, set up discrete Volterra Model in Time Domain, obtain single order rank Volterra time domain core value, Second-Order Volterra time domain core value and the three rank Volterra time domain core values of Volterra progression by this Model in Time Domain being carried out identification, judge the deterioration state of this power model 100 according to each time domain core value and the Deviation Analysis of corresponding normal value.

The concrete principle of the online determination methods of the utility model utility model power module deterioration state is as follows:

The driving signal of the drive end 130 of power model 100 is a voltage pulse signal, and the voltage of this driving signal may adopt different voltage because of different application scenarioss, as 5V voltage, 10V voltage etc.Yet contain the energy storage elements such as inductance, electric capacity due to power model 100, therefore at drive end 130 loading or cancel when driving signal, become when the output signal of power model 100 is, it uses following the Representation Equation:

y(t)＝h(t)·x(t) (1)

Wherein, y (t) is output signal, and x (t) is the driving signal of drive end 130; H (t) is the transfer function matrix operator, and h (t) can be expressed as:

$h\left(t\right)=\left[\begin{array}{ccc}...& ...& ...\\ ...& a_{\mathrm{ij}}\left(t\right)& ...\\ ...& ...& ...\end{array}\right],$

a _ij(t) depend on the inductance L of power model 100 _g, capacitor C _dsC _gd, C _gs, conducting resistance R _on, resistance R _gDeng component parameters, and the deteriorated also reaction of power model 100 is the variation of these component parameters.When power model 100 was deteriorated, its component parameters is corresponding changing also, therefore h (t) changes.

Yet because the variation of h (t) is difficult to observation, for this reason, with the Volterra functional radix representation of y (t) in formula (1), that is:

$y\left(t\right)=\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{y}_n\left(t\right)---\left(2\right)$

Wherein,

$y_n\left(t\right)=\underset{-\∞}{\overset{\∞}{\∫}}...\underset{-\∞}{\overset{\∞}{\∫}}{h}_n({\mathrm{\τ}}_1,...,{\mathrm{\τ}}_n)\underset{i=1}{\overset{n}{\mathrm{\Π}}}x(t-{\mathrm{\τ}}_i)\mathrm{d\τ};$

y _n(t) be power model n rank output functions, h _n(τ ₁..., τ _n) be n rank Volterra cores.

At this line taking, second order, third-order non-linear output characteristic, that is:

$y_1\left(t\right)=\underset{-\∞}{\overset{\∞}{\∫}}{h}_1\left({\mathrm{\τ}}_1\right)x(t-{\mathrm{\τ}}_1)d{\mathrm{\τ}}_1---\left(3\right)$

$y_2\left(t\right)=\underset{-\∞}{\overset{\∞}{\∫}}{h}_2({\mathrm{\τ}}_1,{\mathrm{\τ}}_2)x(t-{\mathrm{\τ}}_1)x(t-{\mathrm{\τ}}_2)d{\mathrm{\τ}}_{1}d{\mathrm{\τ}}_2---\left(4\right)$

$y_3\left(t\right)=\underset{-\∞}{\overset{\∞}{\∫}}{h}_3({\mathrm{\τ}}_1,{\mathrm{\τ}}_2,{\mathrm{\τ}}_3)x(t-{\mathrm{\τ}}_1)x(t-{\mathrm{\τ}}_2)x(t-{\mathrm{\τ}}_3)d{\mathrm{\τ}}_1{\mathrm{d\τ}}_2{\mathrm{d\τ}}_3---\left(5\right)$

(2) formula is transformed into the discrete form of time domain Volterra series model:

$y\left(n\right)=\underset{i_1=0}{\overset{n-1}{\mathrm{\Σ}}}{h}_1\left(i_1\right)x(n-i_1)+\underset{i_1=0}{\overset{n-1}{\mathrm{\Σ}}}\underset{i_2=i_1}{\overset{n-1}{\mathrm{\Σ}}}{h}_2(i_1,i_2)x(n-i_1)x(n-i_2)$

(6)

$+\underset{i_1=0}{\overset{n-1}{\mathrm{\Σ}}}\underset{i_2=i_1}{\overset{n-1}{\mathrm{\Σ}}}\underset{i_3=i_2}{\overset{n-1}{\mathrm{\Σ}}}{h}_3(i_1,i_2,i_3)x(n-i_1)x(n-i_2)x(n-i_3)$

Corresponding formula (3), formula (4) and formula (5) can be transformed to respectively formula (7), formula (8) and formula (9), and be as follows:

$y_1\left(n\right)=\underset{i_1=0}{\overset{n-1}{\mathrm{\Σ}}}{h}_1\left(i_1\right)x(n-i_1)---\left(7\right)$

$y_2\left(n\right)=\underset{i_1=0}{\overset{n-1}{\mathrm{\Σ}}}\underset{i_2=i_1}{\overset{n-1}{\mathrm{\Σ}}}{h}_2(i_1,i_2)x(n-i_1)x(n-i_2)---\left(8\right)$

$y_3\left(n\right)=\underset{i_1=0}{\overset{n-1}{\mathrm{\Σ}}}\underset{i_2=i_1}{\overset{n-1}{\mathrm{\Σ}}}\underset{i_3=i_2}{\overset{n-1}{\mathrm{\Σ}}}{h}_3(i_1,i_2,i_3)x(n-i_1)x\left({n-i}_2\right)x(n-i_3)---\left(9\right)$

Formula (7) represents single order Volterra time domain core, namely represents the linear output characteristic of power model 100; Formula (8) represents Second-Order Volterra time domain core, namely represents the second nonlinear output characteristic of power model 100; Formula (9) represents three rank Volterra time domain cores, namely represents the third-order non-linear output characteristic of power model 100.

deteriorated along with power model 100, according to single order Volterra time domain core, Second-Order Volterra time domain core and three rank Volterra time domains are assessed the single order Volterra time domain core value of calculating, Second-Order Volterra time domain core value and three rank Volterra time domain core values also can change, therefore fully utilize the deteriorated database that the manufacturer of Saber software emulation and power model 100 provides, set up deteriorated rate of change, the sequence relation of threshold value and time, thereby can set up the non-linear threshold of power model 100, the normal value of failure threshold, relatively can judge the deterioration state of power model 100 by power model 100 each time domain core values and corresponding normal value.

Due to, the utility model method and apparatus with the driving signal of power model drive end as input signal, judge the deterioration state of this power model by the size of identification Volterra progression time domain core, therefore the utility model method and apparatus does not need extrinsic motivated but utilizes self signal that the deterioration state of power model is judged, thereby improves reliability and the accuracy of the judgement of power model deterioration state.

Above embodiment only in order to the technical scheme of the utility model embodiment to be described, is not intended to limit; Although with reference to previous embodiment, the utility model embodiment is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model embodiment.

Claims (3)

1. power module degradation determination device, comprise: power model (100), signal gathering unit (500), signal processing unit (600) and caution unit (700), this power model (100) has input end (110), output terminal (120) and drive end (130); It is characterized in that:

Signal gathering unit (500) is connected 130 with the output terminal (120) of power model (100) with drive end) be connected, for the output signal of the output terminal (120) that gathers power model (100) and the driving signal of drive end (130); Signal processing unit (600) carries out Volterra progression time domain core identification analysis according to the driving signal of drive end (130) and the output signal of output terminal (120), and whether this signal processing unit (600) sends information warning according to analysis result control caution unit (700).

2. power module degradation determination device as claimed in claim 1, is characterized in that, this device also comprises:

One first filter unit (200), it is connected with the input end (110) of power model (100), is used for power input module (100) after alternating current large-power power supply shaping filter; And

One second filter unit (300), it is connected with the output terminal (120) of power model (100), is used for the output signal of power model (100) is carried out output linearity DC high-power power supply after shaping filter.

3. power module degradation determination device as claimed in claim 2, it is characterized in that, this device also comprises: a PWM unit (400), it is connected 100 with the second filter unit (300) with power model respectively) drive end (130) be connected, be used for the output signal according to the output signal power ratio control module (100) of the second filter unit (300).

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