Protective circuit for voice frequency circuit system and voice frequency circuit system using same
A technology for protecting circuits and audio circuits, applied in transducer circuits, electrical components, sensor components, etc., can solve the problems of low reliability, easy damage to ceramic speakers, uneven frequency response curve, etc., to improve reliability, The effect of increasing the load
Inactive Publication Date: 2011-01-26
AAC ACOUSTIC TECH (SHENZHEN) CO LTD +1
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Problems solved by technology
[0006] Aiming at the problems of the prior art audio circuit system that the output current is too large, the frequency response curve is not flat, and the ceramic speaker is easily damaged when playing high-frequency signals, the present invention provides a method that effectively reduces the output current when playing high-frequency signals. The current and frequency response curve tends to be flat and the audio circuit system with high reliability of the ceramic speaker is necessary
Method used
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[0025] The audio circuit system of the present invention will be described below with reference to the accompanying drawings.
[0026] See Figure 4 , Is a schematic diagram of the frame structure of the audio circuit system disclosed in the first embodiment of the present invention. The audio circuit system 2 is a system that realizes the conversion between sound signals and electric signals. The audio circuit system 2 includes a power supply unit 21, a power amplifier unit 23, a ceramic speaker unit 25 and a protection circuit 27. The power supply unit 21 provides power to the entire audio circuit system 2.
[0027] The power amplifying unit 23 amplifies the electrical signal from the signal source to drive the ceramic speaker to emit sound. It is designed by multiple functional chips or modules in accordance with the set layout plan to realize signal amplification processing. The receiving end (not shown in the figure) of the power amplifying unit 23 receives the audio signal ...
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The invention provides a protective circuit for a voice frequency circuit system and the voice frequency circuit system using the same. The voice frequency circuit system comprises a power amplification unit, a ceramic loudspeaker unit and the protective circuit which are connected in series, wherein the protective circuit is connected in series with the power amplification unit and the ceramic loudspeaker unit so as to achieve a current limiting or voltage dividing effect. The protective circuit and the voice frequency circuit system using the protective circuit have the advantages of lowering current flowing through the ceramic loudspeaker unit and the power amplification unit, playing a role in limiting the current, effectively protecting the ceramic loudspeaker unit and the power amplification unit and enhancing the reliability of the entire voice frequency circuit system.
Description
Technical field [0001] The invention relates to an audio circuit system protection circuit and an audio circuit system adopting the protection circuit, in particular to an audio circuit system protection circuit for ceramic speakers and an audio circuit system adopting the protection circuit. Background technique [0002] Today's portable devices require smaller, thinner, and more power-efficient electronic components, such as mobile phones with compact designs, and moving coil speakers have become a limiting factor for manufacturers to produce ultra-thin mobile phones. Driven by this demand, ceramic or piezoelectric speakers have rapidly emerged as an alternative to moving coil speakers. Ceramic speakers can provide a very competitive sound pressure level (SPL) in an ultra-thin, compact package, and have great potential to replace traditional moving coil speakers. [0003] Usually the audio circuit system consists of a power amplifier unit and a ceramic speaker unit that are conn...
Claims
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Inventor 黄兴志严绪东
Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD