Approach to detecting latent defects of the printed circuit boards thin-filmed coatings

One of the main reasons for the space vehicles (SV) power supply systems failure is a secondary arc. In the statistics of fatal failures that can lead to the SV loss, the failure rate of the power supply systems is 9%, but despite this, there are no standard methods for diagnosing the on-board equipment for the arc stability, due to the relative novelty of the problem. The problem we encountered is associated with the need to switch power supply systems to the voltage levels that are much higher than the arc voltage in the space vacuum. From the point of view of the defects downing that can lead to arcing, the most vulnerable are the insulation coatings. Therefore, a significant part of the problem solution is concentrated in the development of the specific methods for these coatings diagnostics. In space technology, such diagnostics significance is increased due to the inability to provide necessary repairs or services in the outer space.

A Novel Parallel Current-sharing Control Method of Switch Power Supply

A novel parallel current-sharing control method of switch power supply is proposed, on the basis of a detailed analysis of several common parallel current-sharing control methods and recent related patents. Only the current of switch power modules with maximum and minimum output current will be regulated, which is selected by the extreme current selection circuit in this method. Four cases with different extremum situation are discussed, and in each case, principles and equations are given. Finally the current-sharing control of switch power supply parallel system is realized. Experimental results show that the current-sharing method is reasonable and effective.

Optimization Design of High Frequency Transformer for Multiple Outputs Switching Power Supply

With TOP243Y as control chip of multiplexed output flyback switch power supply, has the advantages of small volume, high integration and strong function, and the high-frequency transformer design and calculation large effect on the overall performance of multiple output the switch power supply. Based on the design computation to optimize the parameters of the transformer can be achieved to improve voltage accuracy, reducing the ripple effect. Seen from the experimental data and waveform of the switching power supply regulator, electromagnetic compatibility are good, meet the design requirements.

Design of Switch Transformer about Half Bridge Switching Power Supply

Half bridge switching power supply is a kind of form in the family. It has the characteristics of good voltage output, high efficiency, the simple circuit and so on. On the design of the half bridge switching power supply, the key and difficult point is the design of switch transformer. Taking the switch transformer of a half bridge switching power supply as the research object and based on the design requirements, this paper aims to realize the calculation of the coil turns and the selection of core in switching transformer. the design of switch transformer of the push-pull switch power supply has been completed by circuit simulation and implementation.

A Flyback Switching Power Supply Based on L6561 for LED

A flyback switching power supply was designed, which can drive LED stability. The switching power supply is the single-ended flyback structure, and based on PWM driver chip L6561. The input voltage range of the switching power supply is 85V to 265V. The output voltage is 15V and the maximum output current is 2A. The switch power supply is suitable for mobile phone, office equipment and LED. According to experiment, the switching power supply can steadily drive 5 LED, the ripple factor of output is 1.33%, the power efficiency is 85.7%.

Important Problem Analysis and Solution of Whole Bridge Type Switching Power Supply

With the rapid development of electronic technology, there is a new content of requirements of electronic instrument and equipment, performance is required for more safety and reliable, function are being asked to more powerful, usage is required higher integration degree. The whole bridge type of switch power supply (WBTSPS) is introduced in this article , combined with the specific application in practice, secondary breakdown problems of power switch tube are analyzed, the output of the rectifier and filter circuit are illustrated, the electromagnetic radiation source (EMI) suppression method are pointed out in switching power supply, PLC wiring problems are solved, for improve the service life of WBTSPS, improve the production efficiency, it has an important guiding significance.