Adaptive Power Supplies for Technological Objects with Non-Stationary Loads

摘要

The implementation of a power amplifier for an electrodynamic vibrating installation is considered in the article. Structural diagrams of the power amplifier are presented. In the article the following problems are solved: synthesis of the structure of power rectifiers; mathematical simulation of the thermal modes of control boards using the finite element method; analysis of research results and development of recommendations. The proposed detailed thermal model of power circuits has allowed to consider the sections on control boards and power plants with local overheating, and this allows in each specific case to develop specific recommendations for the manufacture of coolers. Thus, for the objects of vibrating installations at PAO ChTPZ (Chelyabinsk), a power module for controlling a power vibration unit has been developed and introduced, the specific weight and dimensions parameters of which have been improved by approximately 20% and this task was solved at the expense of changing the configuration of the radiator part of the power unit. It was determined that for the symmetrical distribution of the load current power amplifiers with an analog principle of converting an electrical signal are advisable to implement by a modular principle. To work with different load resistances, the choice of operating mode is used, which also allows to reduce the power output and the overall dimensions of the construction. For more effective reduction of the power dissipated on the power elements, it is advisable to use the adaptive supply voltage of the output stages to the active resistance of the load.