CN103197260B - Photoelectrical coupler degeneration monitoring method and device in Switching Power Supply - Google Patents
Photoelectrical coupler degeneration monitoring method and device in Switching Power Supply Download PDFInfo
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- CN103197260B CN103197260B CN201310092265.4A CN201310092265A CN103197260B CN 103197260 B CN103197260 B CN 103197260B CN 201310092265 A CN201310092265 A CN 201310092265A CN 103197260 B CN103197260 B CN 103197260B
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Abstract
The present invention provides photoelectrical coupler degeneration monitoring method in a kind of Switching Power Supply, comprises the steps: switched power output load is applied current pulse signal, obtains the response signal of described Switching Power Supply; It is shaped as squared pulse trains after described response signal being amplified; Read the square-wave pulse number in described squared pulse trains, judge whether photoelectrical coupler degenerates by described square-wave pulse number. The present invention also provides for photoelectrical coupler degeneration monitoring device in a kind of Switching Power Supply accordingly. The present invention is without dismantling power source internal structure, and can realize the real time and on line monitoring to photoelectrical coupler when Switching Power Supply normal operation.
Description
Technical field
The present invention relates to Switching Power Supply monitoring technical field, particularly relate to photoelectrical coupler degeneration monitoring method in a kind of Switching Power Supply and photoelectrical coupler degeneration monitoring device in a kind of Switching Power Supply.
Background technology
Switching Power Supply is widely used in the numerous areas such as computer, communication, Aero-Space. Compared with other electricity subsystems, Switching Power Supply has higher crash rate than assembly downstream, is the weak link of system. Once it breaks down, will cause that downstream components operation irregularity is even damaged, cause serious consequence difficult to the appraisal. So the malfunction monitoring of Switching Power Supply is just particularly important.
The existing mode to Switching Power Supply malfunction monitoring mainly has internal measurement and externally measured two kinds. Externally measured method has by the monitoring to Switching Power Supply output stage ripple voltage, to reach the purpose of predictive filtering electric capacity health status. The method of internal measurement has reacts its health status by chip to the measurement of Switching Power Supply negative feedback loop dutycycle.
Photoelectrical coupler in Switching Power Supply is the components and parts with photoelectric coupling, current gain and current transmission characteristic combined by light emitting diode and phototriode. Wherein light emitting diode plays effect input current being transformed into the signal of telecommunication, and phototriode then plays effect converting optical signals being become current signal. Owing between light emitting diode and phototriode not being the direct-coupling of electricity and electricity, but light and electric INDIRECT COUPLING, therefore it is the coupled apparatus with isolation characteristic. Photoelectrical coupler occurs in the control loop of Switching Power Supply, generally plays the effects such as switch, transmission error of sampling signal and the voltage stabilizing control taken over from the past and set a new course for the future. One important technical parameter of photoelectrical coupler is current transfer ratio (CTR), and its value is equal to the ratio of output electric current with input current.Due to reasons such as light-emitting diode luminous efficiency degenerations, photoelectrical coupler can produce degradation phenomena, and the form of expression of its degeneration is exactly the change of CTR numerical value.
Existing photoelectrical coupler fault diagnosis mode is included: photoelectrical coupler is directly taken out, measures its CTR numerical value; Or by " optocoupler short-circuit method ". By by force short for the negative pole of photoelectrical coupler light emitting diode, electric power output voltage should decline, if output voltage is constant, illustrates that optocoupler is bad.
The shortcoming of above two mode has: removes photoelectrical coupler voluntarily or its light emitting diode ground connection by force all can Switching Power Supply itself be caused damage to measure electric power output voltage; It is only capable of and judges whether photoelectrical coupler damages, without reflecting its degenerate case, it is impossible to be predicted; Fail to realize the monitoring of degenerating online to Switching Power Supply photoelectrical coupler, namely when Switching Power Supply normal operation, it is impossible to judge the health status of its photoelectrical coupler.
Summary of the invention
Based on this, the present invention provides photoelectrical coupler degeneration monitoring method and device in a kind of Switching Power Supply, it is not necessary to power source internal structure is dismantled, and can realize the real time and on line monitoring to photoelectrical coupler when Switching Power Supply normal operation.
Photoelectrical coupler degeneration monitoring method in a kind of Switching Power Supply, comprises the steps:
Switched power output load is applied current pulse signal, obtains the response signal of described Switching Power Supply;
It is shaped as squared pulse trains after described response signal being amplified;
Read the square-wave pulse number in described squared pulse trains, judge whether photoelectrical coupler degenerates by described square-wave pulse number;
Wherein, described judged that by described square-wave pulse number the step whether photoelectrical coupler degenerates is:
If the square-wave pulse number that the current described square-wave pulse number read reads less than last time sampling, then judge that described photoelectrical coupler is degenerated.
In a kind of Switching Power Supply, photoelectrical coupler is degenerated and is monitored device, including pulse generator, signal amplification circuit, shaping circuit, enumerator and processor;
Described pulse generator and signal amplification circuit are connected with the outfan of Switching Power Supply respectively, and described signal amplification circuit, shaping circuit, enumerator and processor are sequentially connected with;
Described pulse generator is for applying current pulse signal to switched power output load;
Described response signal, for obtaining the response signal of described Switching Power Supply, is amplified by described signal amplification circuit;
Described shaping circuit is for being shaped as squared pulse trains by the response signal after amplification;
Described enumerator is for reading the square-wave pulse number in described squared pulse trains;
By described square-wave pulse number, described processor is for judging whether photoelectrical coupler degenerates;
Wherein, described processor is additionally operable to: if the square-wave pulse number that the current described square-wave pulse number read reads less than last time sampling, then judge that described photoelectrical coupler is degenerated.
Photoelectrical coupler degeneration monitoring method and device in above-mentioned Switching Power Supply, power supply output stage load is applied current pulse signal, by receiving Switching Power Supply to response signal produced by this pulse, this response signal is processed, obtain its square-wave pulse number, the change of its current transfer ratio CTR is determined from the change of square-wave pulse number, realize the real-time monitoring to Switching Power Supply photoelectrical coupler degenerate case, it is recorded optocoupler degenerate case following the tracks of, facilitate user that power supply health status is judged, avoid power supply catastrophic failure, prevent circuit downstream from serious problems occurring,The present invention can carry out data process by single-chip microcomputer, simple, with low cost;
Apparatus of the present invention can be directly accessed power supply output stage, it is not necessary to takes out photoelectrical coupler, it is not necessary to power source internal structure is dismantled, simple to operate, had both avoided the damage to photoelectrical coupler or other adjacent devices, and had also improved monitoring efficiency simultaneously.
Accompanying drawing explanation
Fig. 1 is photoelectrical coupler degeneration monitoring method schematic flow sheet in one embodiment in Switching Power Supply of the present invention.
Fig. 2 is photoelectrical coupler degeneration monitoring device structural representation in one embodiment in Switching Power Supply of the present invention.
Fig. 3 is the electrical block diagram of pulse generator in Fig. 2.
Fig. 4 is the electrical block diagram of signal amplification circuit in Fig. 2.
Fig. 5 is sinusoidal damped oscillation schematic diagram during photoelectrical coupler a certain CTR value in Fig. 2.
Fig. 6 is sinusoidal damped oscillation schematic diagram during photoelectrical coupler a certain CTR value in Fig. 2.
The squared pulse trains of shaping circuit output when Fig. 7 is a certain CTR value of photoelectrical coupler in Fig. 2.
The squared pulse trains of shaping circuit output when Fig. 8 is a certain CTR value of photoelectrical coupler in Fig. 2.
Fig. 9 is the relation schematic diagram in Fig. 2 between photoelectrical coupler CTR value and square-wave pulse number.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
As it is shown in figure 1, be the monitoring method of photoelectrical coupler schematic flow sheet in one embodiment in Switching Power Supply of the present invention, comprise the steps:
S11, to switched power output load apply current pulse signal, obtain the response signal of described Switching Power Supply;
S12, by described response signal amplify after be shaped as squared pulse trains;
By described square-wave pulse number, S13, the square-wave pulse number read in described squared pulse trains, judge whether photoelectrical coupler degenerates;
The present invention considers that an important technical parameter of photoelectrical coupler is current transfer ratio (CTR), and its value is equal to the ratio of output electric current with input current. Due to reasons such as light-emitting diode luminous efficiency degenerations, photoelectrical coupler can produce degradation phenomena, and the form of expression of its degeneration is exactly the change of CTR numerical value;
If Switching Power Supply is applied current pulse signal, it can be produced response signal by Switching Power Supply, this response signal is sinusoidal damped oscillation, it is relevant that this sinusoidal damped oscillation controls loop with Switching Power Supply, namely loop gain is more big, the frequency of concussion is more big, and photoelectrical coupler occurs among control loop, CTR is a factor of integral loop gain, so, CTR numerical value is more big, loop gain is more big, the frequency of sinusoidal damped oscillation is also more big, and the degeneration of photoelectrical coupler directly causes the decline of its CTR numerical value, so by the frequency monitoring of the current pulse signal to Switching Power Supply, just can embody the size of photoelectrical coupler CTR, and then play the effect of its monitoring of degenerating,
Therefore in the present embodiment, first pass through and switched power output load is applied current pulse signal, Switching Power Supply transient response, obtain its response signal; Arranging suitable amplification according to actual needs, this response signal be amplified, the response signal after amplification can be shaped as squared pulse trains, reads its square wave number, thus judging whether photoelectrical coupler degenerates.
In a preferred embodiment, judge, by described square-wave pulse number, step that whether photoelectrical coupler degenerate particularly as follows: the square-wave pulse number that reads less than last time sampling of the current described square-wave pulse number read if described, then judge that described photoelectrical coupler is degenerated;Therefore by the present invention, regularly Switching Power Supply being detected, the square-wave pulse number that record obtains, analyze the situation of change of different time stage square-wave pulse number, thus obtaining the degenerate case of photoelectrical coupler in Switching Power Supply, reaching the purpose of monitoring in real time.
In a preferred embodiment, after the described step described response signal amplified, may also include the maximum voltage step lower than default voltage threshold being controlled described response signal by mu balanced circuit, it is prevented that signal oscillating amplitude is excessive;
In a preferred embodiment, before the described step described response signal amplified, also including the step that described response signal carries out DC-isolation, the waveform that can make response signal is steady and audible;
In a preferred embodiment, before the described step described response signal amplified, also including the step that described response signal is filtered, elimination burr clutter, the waveform that can make response signal is steady and audible.
The present invention also provides for the monitoring device of photoelectrical coupler in a kind of Switching Power Supply, as in figure 2 it is shown, include pulse generator 21, signal amplification circuit 22, shaping circuit 23, enumerator 24 and processor 25;
Described pulse generator 21 and signal amplification circuit 22 are connected with the outfan of Switching Power Supply 20 respectively, and described signal amplification circuit 22, shaping circuit 23, enumerator 24 and processor 25 are sequentially connected with;
Described pulse generator 21 is for applying current pulse signal to Switching Power Supply 20 outfan load;
Described response signal, for obtaining the response signal of described Switching Power Supply 20, is amplified by described signal amplification circuit 22;
Described shaping circuit 23 is for being shaped as squared pulse trains by the response signal after amplification;
Described enumerator 24 is for reading the square-wave pulse number in described squared pulse trains;
By described square-wave pulse number, described processor 25 is for judging whether photoelectrical coupler degenerates;
In a preferred embodiment, described amplifying circuit includes mu balanced circuit, is used for the maximum voltage controlling described response signal lower than default voltage threshold, it is prevented that signal oscillating amplitude is excessive;
In a preferred embodiment, described amplifying circuit includes isolation capacitance, and for described response signal is carried out DC-isolation, the waveform that can make response signal is steady and audible;
In a preferred embodiment, described amplifying circuit includes filter capacitor, for described response signal is filtered, and elimination burr clutter, the waveform that can make response signal is steady and audible;
In a preferred embodiment, described processor is additionally operable to: if the square-wave pulse number that the current described square-wave pulse number read reads less than last time sampling, then judge that described photoelectrical coupler is degenerated.
The present invention is further illustrated below by a specific embodiment.
In the present embodiment, described processor adopts microprocessor AT89C2051, the conventional Switching Power Supply 20 selecting test model to be EPM U15T5 �� 12 is monitored, pulse generator 21 is connected to an outfan of Switching Power Supply 20, signal amplification circuit 22 is also connected to the outfan of Switching Power Supply 20, the current impulse that pulsewidth is 10 �� s is produced by pulse generator 21, in the load of the positive 5V outfan that this pulse is applied, output voltage produces response signal, this response signal is the sinusoidal damped oscillation of amplitude taper, and surge frequency range is 2MHz to 5MHz; Signal amplification circuit 22, shaping circuit 23, enumerator 24 and processor 25 are sequentially connected with;In response signal entering signal amplifying circuit 22, in the present embodiment, amplifying circuit is provided with mu balanced circuit, isolation capacitance and filter capacitor, DC-isolation and elimination clutter is carried out by capacitance and filter capacitor, limited by the voltage of mu balanced circuit, the ceiling voltage amplitude after amplifying is clamped down at about 5V.
Signal after amplification is through shaping circuit 23, produce the squared pulse trains of 5V, after being counted by enumerator 24, single-chip microcomputer store and show the number of square-wave pulse, play the effect of monitoring impulse response, and then reach the purpose of monitoring photoelectrical coupler degenerate case.
In the present embodiment, according to the specification of the Switching Power Supply 20 that need to monitor, suitable pulse generator 21, Fig. 3 can be selected to illustrate the one of which electrical block diagram of pulse generator 21, wherein C1=0.1 �� F, C2=0.1 �� F, C3=100 �� F, C4=22 �� F, CY1=CY2=30 �� F, R1=2k ��, R2=2.17k ��, R3=1k ��, RDFor high-power low resistance; Crystal oscillator model is C2605, and single-chip microcomputer model is AT89C2051; VCCFor 12V, 7805 integrated regulators by the Control of Voltage of OUT terminal at 5V, by mcu programming makes current pulse width be 10 �� s, will with RDThe A port that one end is connected is connected with the positive 5V outfan of Switching Power Supply 20, and earth terminal with Switching Power Supply 20 altogether, namely can produce sinusoidal damped oscillation.
Fig. 4 illustrates the one of which electrical block diagram of signal amplification circuit 22, and wherein A port is connected with the positive 5V outfan of Switching Power Supply 20, and after pulse generating circuit produces current impulse, impulse response Switching Power Supply 20 produced accesses in circuit. By capacitance C5By the positive 5V DC voltage of sinusoidal damped oscillation every going. Owing to this frequency of oscillation is relatively big, being about 2MHz to 5MHz, so selecting high speed operation amplifier AD817, signal being amplified, it is contemplated that the Amplitude Comparison of signal own is big, and amplification is set to 2.5 times, by Zener diode, ceiling voltage is controlled at 5.2V afterwards. Electric capacity C in circuit8For 221pF, play elimination burr clutter effect. B port will access shaping circuit 23 together with positive 5V DC voltage, produce squared pulse trains.
Fig. 5 and Fig. 6 is damped oscillation during photoelectrical coupler difference CTR value, and wherein CTR1 is more than CTR2, by observing it appeared that vibrate 1 frequency more than the frequency of vibration 2, the visible crest number of 1 waveform that vibrates is also greater than vibration 2. Thus more big with CTR, the theory that damped oscillation frequency is more big matches.
Fig. 7 and Fig. 8 is the squared pulse trains of shaping circuit output. It can be seen that the squared pulse trains crest number corresponding to CTR1 is 9, the squared pulse trains crest number corresponding to CTR2 is 6. Crest number directly reflects the frequency size of damped oscillation, thus demonstrating the CTR numerical values recited of photoelectrical coupler intuitively.
Fig. 9 is the relation between photoelectrical coupler CTR and square-wave pulse number, changes the CTR of photoelectrical coupler, can measure counterparty's wave impulse number by this device. Should be noted excessive CTR can make Switching Power Supply cannot normal operation, even cause assembly to damage.
Photoelectrical coupler degeneration monitoring method and device in Switching Power Supply of the present invention, power supply output stage load is applied current pulse signal, by receiving Switching Power Supply to response signal produced by this pulse, this response signal is processed, obtain its square-wave pulse number, the change of its current transfer ratio CTR is determined from the change of square-wave pulse number, realize the real-time monitoring to Switching Power Supply photoelectrical coupler degenerate case, it is recorded optocoupler degenerate case following the tracks of, facilitate user that power supply health status is judged, avoid power supply catastrophic failure, prevent circuit downstream from serious problems occurring,The present invention can carry out data process by single-chip microcomputer, simple, with low cost;
Apparatus of the present invention can be directly accessed power supply output stage, it is not necessary to takes out photoelectrical coupler, it is not necessary to power source internal structure is dismantled, simple to operate, had both avoided the damage to photoelectrical coupler or other adjacent devices, and had also improved monitoring efficiency simultaneously.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention. It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. photoelectrical coupler degeneration monitoring method in a Switching Power Supply, it is characterised in that comprise the steps:
Switched power output load is applied current pulse signal, obtains the response signal of described Switching Power Supply;
By high speed operation amplifier AD817, described response signal is amplified 2.5 times;
Response signal after amplifying is shaped as squared pulse trains;
Read the square-wave pulse number in described squared pulse trains, judge whether photoelectrical coupler degenerates by described square-wave pulse number;
Wherein, described judged that by described square-wave pulse number the step whether photoelectrical coupler degenerates is:
If the square-wave pulse number that the current described square-wave pulse number read reads less than last time sampling, then judge that described photoelectrical coupler is degenerated.
2. photoelectrical coupler degeneration monitoring method in Switching Power Supply according to claim 1, it is characterized in that, after the step described response signal amplified, also include the maximum voltage step lower than default voltage threshold being controlled the response signal after amplifying by mu balanced circuit.
3. photoelectrical coupler degeneration monitoring method in Switching Power Supply according to claim 1, it is characterised in that before the step described response signal amplified, also includes the step that described response signal carries out DC-isolation.
4. photoelectrical coupler degeneration monitoring method in the Switching Power Supply according to claim 1 or 3, it is characterised in that before the step described response signal amplified, also include the step that described response signal is filtered.
5. photoelectrical coupler degeneration monitoring device in a Switching Power Supply, it is characterised in that include pulse generator, signal amplification circuit, shaping circuit, enumerator and processor;
Described pulse generator and signal amplification circuit are connected with the outfan of Switching Power Supply respectively, and described signal amplification circuit, shaping circuit, enumerator and processor are sequentially connected with;
Described pulse generator is for applying current pulse signal to switched power output load;
Described response signal, for obtaining the response signal of described Switching Power Supply, is amplified 2.5 times by high speed operation amplifier AD817 by described signal amplification circuit;
Described shaping circuit is for being shaped as squared pulse trains by the response signal after amplification;
Described enumerator is for reading the square-wave pulse number in described squared pulse trains;
By described square-wave pulse number, described processor is for judging whether photoelectrical coupler degenerates;
Wherein, described processor is additionally operable to: if the square-wave pulse number that the current described square-wave pulse number read reads less than last time sampling, then judge that described photoelectrical coupler is degenerated.
6. photoelectrical coupler degeneration monitoring device in Switching Power Supply according to claim 5, it is characterised in that described amplifying circuit includes mu balanced circuit, is used for the maximum voltage controlling the response signal after amplifying lower than default voltage threshold.
7. photoelectrical coupler degeneration monitoring device in Switching Power Supply according to claim 5, it is characterised in that described amplifying circuit includes isolation capacitance, for described response signal is carried out DC-isolation.
8. photoelectrical coupler degeneration monitoring device in the Switching Power Supply according to claim 5 or 7, it is characterised in that described amplifying circuit includes filter capacitor, for described response signal is filtered.
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| CN201310092265.4A CN103197260B (en) | 2013-03-21 | 2013-03-21 | Photoelectrical coupler degeneration monitoring method and device in Switching Power Supply |
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| CN201310092265.4A CN103197260B (en) | 2013-03-21 | 2013-03-21 | Photoelectrical coupler degeneration monitoring method and device in Switching Power Supply |
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| CN103197260B true CN103197260B (en) | 2016-06-08 |
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| CN103364741A (en) * | 2013-07-19 | 2013-10-23 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted electronic product power supply pulse automated test system |
| CN113945857B (en) * | 2021-10-25 | 2024-10-11 | 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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| KR100235195B1 (en) * | 1992-05-30 | 1999-12-15 | 윤종용 | Testing method and its circuit for photo coupler |
| CN2690894Y (en) * | 2004-03-09 | 2005-04-06 | 鸿富锦精密工业（深圳）有限公司 | Fan motor detection circuit |
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| CN201662599U (en) * | 2010-01-21 | 2010-12-01 | 深圳市炜烨丰电子科技有限公司 | Photoelectric coupler detection device |
| CN201673224U (en) * | 2010-05-24 | 2010-12-15 | 北京航天光华电子技术有限公司 | Intelligent surface-mounted optical coupling tester |
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