Power amplifier with online impedance monitoring function and adjusting method thereof

Abstract

The invention discloses a power amplifier with a online impedance monitoring function and an adjusting method thereof. The power amplifier comprises a power amplification unit and an online impedance monitoring unit, the power amplification unit comprises a power amplification controller, a driving circuit and a power amplification module which are connected in sequence, the power amplification controller is connected with an input information source, the power amplification module is connected with a load, the online impedance monitoring unit comprises an information processing module, an amplitude detection circuit, a phase preprocessing circuit and a voltage and current acquisition circuit, the input end of the voltage and current acquisition circuit is connected with the output circuit of the power amplification unit, the output end is connected with the amplitude detection circuit and the phase preprocessing circuit, the amplitude detection circuit and the phase preprocessing circuit are connected with the information processing module, and the information processing module is connected with the power amplification controller. According to the invention, the load impedance is monitored in real time through the online impedance monitoring unit, the gain of the power amplification module is adjusted, and the problem of circuit mismatching caused by the gain parameter of the power amplifier is solved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a power amplifier equipped with online impedance monitoring and an adjustment method thereof. Background technique [0002] At present, power amplifiers often use the load impedance data after off-line testing for impedance matching and drive parameter setting, and loads such as the transducer’s own temperature, load changes, and environmental factors will cause changes in its impedance characteristics when it is working. If the power The gain parameter of the amplifier has not changed accordingly, which will inevitably cause the whole circuit to be mismatched, which may lead to load damage or poor actual driving effect. Therefore, it is necessary to design a power amplifier that can effectively solve the above problems. Contents of the invention [0003] (1) Technical problems to be solved [0004] Based on the above problems, the present invention provides a power ...

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Problems solved by technology

[0004] Based on the above problems, the present invention provides a power amplifier with online impedance monitoring and its adjustment method, which solves the problem that the gain parameters of the power amplifier will cause circuit mismatch

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