Power amplifier, power control system and method of electric vibration table

Abstract

The invention discloses a power amplifier of an electric vibration table. The power amplifier comprises a first power supply circuit, a PWM rectification circuit, a second power supply circuit, a PWMinversion circuit, and a filtering circuit which are electrically connected with one another sequentially; the power amplifier of the electric vibration table further comprises a control circuit, a sampling circuit and a driving circuit, wherein the sampling circuit and the driving circuit are electrically connected with the control circuit; the control circuit is electrically connected with the first power supply circuit; the driving circuit is connected with the PWM inversion circuit and the PWM rectification circuit; and the sampling circuit is electrically connected with the PWM rectification circuit and the PWM inversion circuit. The PWM rectification circuit and the PWM inversion circuit can both adopt SiC power devices; each power device has a real-time short-circuit protection function; the power devices are not enabled during a bus voltage establishment process; and therefore, the defects of low reliability and short service life of a traditional power amplifier can be avoided, and the power amplifier of the invention is highly reliable.

Description

technical field [0001] The invention relates to the field of power amplification, in particular to a power amplifier of an electric vibrating table, a power control system and a method. Background technique [0002] With the rapid development of the aerospace and automotive electronics industries, various test equipment for simulating the operating conditions of equipment are more and more urgently needed. As an effective means of simulating the vibration test environment and testing the reliability of equipment and the strength of components, the shaking table test has been widely used in the performance and strength appraisal of equipment. Traditional electric test benches use MOSFETs made of Si materials as power devices, which have defects such as high power consumption, low efficiency, severe device heating, and low reliability. The reliability of the new generation of power amplifiers based on IGBTs as power devices has been greatly improved, but due to the low switch...

AI Technical Summary

Problems solved by technology

Traditional electric test benches use MOSFETs made of Si materials as power devices, which have defects such as high power consumption, low efficiency, serious device heating, and low reliability.

The reliability of the new generation of power amplifiers based on IGBTs as power devices has been greatly improved, but due to the low switching frequency of the devices, the output cut-off frequency of the power amplifier is low, and the high-frequency waveform is severely distorted.

At the same time, power amplifiers of various power levels are required for vibration tables of different powers, which makes the design cycle long

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