Transformer matching method for ultrasonic energy conversion module driving impedance

Abstract

The invention discloses a method for driving an impedance transformer by an ultrasonic energy conversion module. According to the frequency (generally 40khz) of an ultrasonic directional sound, a primary inductance is designed with an impedance at least 2.5 times greater than the output impedance of a power amplifier and a secondary inductance at a specified frequency. An autotransformer with an impedance at least 2.5 times greater than the sensor array at the specified frequency. According to the method for driving an impedance transformer by an ultrasonic energy conversion module of the present invention, the ultrasonic directional sound made by the provided transformer has an impedance and a driving voltage that are more matched with the ultrasonic energy conversion module array, so that the energy conversion efficiency of the rear stage of the ultrasonic directional sound can reach Compared with directly increasing the voltage of the power amplifier or simply adding ultrasonic energy conversion modules to achieve matching, the energy utilization rate has been greatly improved.

Description

technical field [0001] The invention relates to the technical field of transformer matching methods, in particular to a method for driving an impedance matching transformer by an ultrasonic energy conversion module. Background technique [0002] Ultrasonic directional audio includes sound signal acquisition unit, sound signal processing unit, driving power amplifier unit and ultrasonic energy conversion module array unit. The impedance of the ultrasonic energy conversion module is generally around 2Ω-16Ω, while the impedance of the ultrasonic energy conversion module is mostly around 1K. The transformer at the front end of the existing ultrasonic energy conversion module does not match, resulting in impedance mismatch and low conversion efficiency in the process of realizing ultrasonic directional sound. Low power, severe heat generation of power amplifier, insufficient driving voltage and other problems. In order for the ultrasonic energy conversion module to work more eff...

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Problems solved by technology

[0002] Ultrasonic directional audio includes sound signal acquisition unit, sound signal processing unit, driving power amplifier unit and ultrasonic energy conversion module array unit. The impedance of the ultrasonic energy conversion module is generally around 2Ω-16Ω, while the impedance of the ultrasonic energy conversion module is mostly around 1K. The transformer at the front end of the existing ultrasonic energy conversion module does not match, resulting in impedance mismatch and low conversion efficiency in the process of realizing ultrasonic directional sound. low power amplifier, severe heat generation, insufficient driving voltage, etc.

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