Measurement method for bearing power of loudspeaker and measurement device thereof

Abstract

The invention discloses a measurement method for bearing power of a loudspeaker and a measurement device thereof. The method comprises the steps of obtaining resistance R <0 > of a loudspeaker voice coil under environment temperature; superposing pink noises, enabling the loudspeaker to continuously work for a plurality of units of time, and recording the resistance R <n > corresponding to the loudspeaker voice coil at each unit of time node; and obtaining the resistance value R <t > of the loudspeaker voice coil after the temperature of the loudspeaker voice coil is balanced, and a current value I applied to the loudspeaker voice coil, and calculating the bearing power W<t > of the loudspeaker. The measurement device comprises a microcontroller and a measurement circuit connected between a power amplifier and the loudspeaker. The measurement circuit comprises a capacitor, a current source, a first filter, a second filter and a voltmeter. The current source is connected with two ends of the loudspeaker in parallel through the first filter. The voltmeter is connected with the two ends of the loudspeaker in parallel through the second filter. The capacitor is connected with a loop of the measurement circuit in series. According to the method and the device, the bearing power of the loudspeaker can be measured accurately, the measurement speed is fast and the consumed time is short.

Description

technical field [0001] The invention relates to the technical field of loudspeaker withstand power measurement, in particular to a measurement method and a measurement device for loudspeaker withstand power with accurate measurement and fast measurement speed. Background technique [0002] Most speaker voice coils will be damaged after working at 200 degrees Celsius for a period of time. Depending on the materials used for the voice coil, frame, glue, etc., this value will be different and needs to be set by the user. Calculated based on the ambient temperature of 25 degrees Celsius, if the voice coil of the speaker is allowed to be 200 degrees Celsius, the allowable temperature rise is 175 degrees Celsius. In order to improve the durability and service life of the speaker, it is necessary to measure the withstand power of the speaker to ensure that the speaker will not work above the withstand power and avoid burning the speaker. Therefore, it is necessary for the loudspea...

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