Device loss balance optimization control method for cascaded full-bridge type multi-level power amplifier

Abstract

The invention discloses a device loss balance optimization control method for a cascaded full-bridge type multi-level power amplifier. For the cascaded full-bridge type multi-level power amplifier adopting independent direct-current power supply, an output continuous mathematical equation of the cascaded full-bridge type multi-level power amplifier is established, and an output discrete mathematical equation of the cascaded full-bridge type multi-level power amplifier is obtained; a sampled output current i at a current moment and a reference output current iref are substituted into an outputdiscrete mathematical equation, and an optimal output level Nopt, at the next moment, of the cascaded full-bridge type multi-level power amplifier is obtained; reliable input coefficients lambda of full-bridge submodules are defined, and according to whether the full-bridge submodules act or not and the magnitude of an output current of the power amplifier, the input coefficients lambda corresponding to the full-bridge submodules are calculated in real time; and the input coefficients lambda of all the modules are sorted, and the |Nopt| submodules are selected in sequence from big to small tojointly output the optimal level Nopt. According to the method, rapid tracking of the output current can be ensured, and the switch loss balance control of all the full-bridge submodules can be realized.

Description

technical field [0001] The invention relates to the balanced optimization control of sub-module loss of a cascaded full-bridge multi-level power amplifier device powered by an independent direct current, in particular to a loss balanced optimization control method of a cascaded full-bridge multi-level power amplifier device. Background technique [0002] With the rapid development of power electronics, power amplifiers have been more and more widely used in various occasions such as industrial production, scientific research and teaching. In terms of topology, traditional analog power amplifiers are often used in low-power audio sounding equipment due to their high-fidelity characteristics. With the improvement of power level requirements for power amplifiers in applications, the defects of low operating efficiency of traditional analog power amplifiers gradually emerged, and switching digital power amplifiers emerged as the times require. Switching digital power amplifiers...

AI Technical Summary

Problems solved by technology

However, when the cascaded full-bridge power amplifier system based on an independent DC power supply adopts model predictive control, if the output level distribution is not reasonable, it will easily cause uneven distribution of losses among the full-bridge sub-modules, resulting in uneven heat dissipation of the system. System design creates difficulties, and on the other hand, it also brings uncertainty to the stable and reliable operation of the power amplifier system

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