Power amplifier

Abstract

The invention discloses a power amplifier which comprises a controller, a driving module, a power amplification module and a filtering module, the controller is electrically connected with the power amplification module through the driving module and transmits PWM modulation signals, and the output end of the power amplification module is electrically connected with the filtering module; wherein the power amplification module comprises n power amplification units, each power amplification unit comprises an input end and an output end, the input ends of the n power amplification units are connected in series, the output ends of the n power amplification units are connected in parallel, and the input end of the power amplification module is connected with an external high-voltage direct-current power supply unit. The n power amplification units of the power amplification module are connected in an input series connection and output parallel connection mode, the power of a plurality of amplification signals is synthesized, and the grade of the working input voltage and the size of the output signal power of the power amplifier can be adjusted by adjusting the number of the power amplification units, thus to be adaptive to occasions with different power outputs and different voltage inputs.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a power amplifier. Background technique [0002] Since entering the 21st century, power electronics technology has developed rapidly, and power amplifiers have been widely used in many fields of social life. Traditional analog power amplifiers and Class AB power amplifiers have disadvantages such as low efficiency, large volume, and bulkiness. The digital power amplifier is not only simple in structure, high in transmission efficiency and easy to integrate, but also has obvious advantages in volume, weight, efficiency and reliability, etc., and has developed rapidly in recent years. [0003] However, due to the technical level and technical limitations of power switching devices, the power level, voltage level and switching frequency of single-module digital power amplifiers are limited, and it is difficult to meet the needs of some high-voltage input, high-power, and ...

AI Technical Summary

Problems solved by technology

[0005] However, due to the non-ideal switching characteristics of the device, the equivalent input capacitance increases after the series-parallel connection, and the actual switching frequency is further reduced, resulting in the deterioration of the digital power amplifier distortion and the increase in the size of the filter module.

In addition, since the characteristics of each device / module cannot be exactly the same, the voltage and current borne by each device / module will be unbalanced, and even cause damage to the device, and the system reliability will deteriorate.

At the same time, the use of two-stage power conversion greatly reduces the working efficiency of the power amplifier and increases the complexity of the control logic

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