Degradation monitoring method and device of photoelectric coupler in switching power supply
A technology of optocoupler and switching power supply, applied in the field of optocoupler degradation monitoring device in switching power supply, can solve the problem of failure to realize on-line degradation monitoring of optocoupler of switching power supply, failure to judge the health status of optocoupler, failure to make predictions, etc. problems, to avoid sudden failures, improve monitoring efficiency, and prevent serious problems
Active Publication Date: 2013-07-10
FIFTH ELECTRONICS RES INST OF MINIST OF IND & INFORMATION TECH
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[0006] The disadvantages of the above two methods are: self-removal of the photocoupler or grounding its light-emitting diode forcibly to measure the output voltage of the power supply will cause damage to the switching power supply itself; it can only judge whether the photocoupler is damaged, but does not reflect its degradation. , can not be predicted; fail to realize the on-line degradation monitoring of the optocoupler of the switching power supply, that is, when the switching power supply is working normally, it is impossible to judge the health status of the optocoupler
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[0030] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0031] like figure 1 As shown, it is a schematic flow diagram of an embodiment of the monitoring method of the optocoupler in the switching power supply of the present invention, including the following steps:
[0032] S11. Applying a current pulse signal to the load at the output end of the switching power supply to obtain a response signal of the switching power supply;
[0033] S12. Amplifying the response signal and shaping it into a square wave pulse sequence;
[0034] S13. Read the number of square wave pulses in the square wave pulse sequence, and judge whether the photocoupler is degraded by the number of square wave pulses;
[0035] The present invention takes into account that an important technical parameter of optocouplers is the current transfer ratio (CTR), w...
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The invention provides a degradation monitoring method of a photoelectric coupler in a switching power supply. The degradation monitoring method comprises the following steps: exerting current pulse signals on the output end load of the switching power supply, and obtaining response signals of the switching power supply; after amplifying the response signals, reshaping the amplified response signals to be a square wave pulse sequence; reading the number of square wave pulses in the square wave pulse sequence, and judging whether the photoelectric coupler degrades or not through the number of the square wave pulses. Correspondingly, the invention further provides a degradation monitoring device of the photoelectric coupler in the switching power supply. According to the degradation monitoring method and the device, an internal structure of the switching power supply doesn't need to be dismantled, and real-time on-line monitoring to the photoelectric coupler is achieved when the switching power supply normally works.
Description
technical field [0001] The invention relates to the technical field of switching power supply monitoring, in particular to a method for monitoring the degradation of a photoelectric coupler in a switching power supply, and a device for monitoring the degradation of a photoelectric coupler in a switching power supply. Background technique [0002] Switching power supplies are widely used in many fields such as computers, communications, and aerospace. Compared with other electrical subsystems, switching power supplies have a higher failure rate than their downstream components and are the weak link of the system. Once it fails, the downstream components will work abnormally or even be damaged, causing inestimable and serious consequences. So it is particularly important to monitor the fault of switching power supply. [0003] Existing methods for monitoring switching power supply faults mainly include internal measurement and external measurement. The method of external me...
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IPC IPC(8): G01R31/40
Inventor 李梦奇史峥宇陆裕东冯敬东孔学东王晓晗恩云飞黄云
Owner FIFTH ELECTRONICS RES INST OF MINIST OF IND & INFORMATION TECH