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Loudspeaker protection circuit

A technology for protecting circuits and speakers, applied to emergency protection circuit devices, transducer circuits, circuit devices, etc., can solve problems such as speaker burnout, and achieve the effect of preventing burnout and protecting speakers

Active Publication Date: 2015-03-25
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing loudspeaker is easy to be burned, the present invention proposes a loudspeaker protection circuit, which can solve the above problems

Method used

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  • Loudspeaker protection circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, this embodiment proposes a loudspeaker protection circuit, such as figure 1 As shown, it includes a first switch and a second switch respectively connected to the two-way differential audio signal lines of the loudspeaker, and also includes a comparison circuit for comparing whether the two-way signals of the two-way differential audio signals are the same, and the same as the A switch control circuit connected to the comparison circuit, the comparison circuit sends a comparison signal to the switch control circuit, and the switch control circuit generates a control signal for controlling the conduction states of the first switch and the second switch according to the comparison signal and sent to the first switch and the second switch. In the speaker protection circuit of the present invention, by setting the first switch and the second switch on the differential audio signal transmission line of the speaker, a control command for controlling the first sw...

Embodiment 2

[0027] Embodiment 2. This embodiment presents a circuit schematic diagram of another embodiment of the switch control circuit in the speaker protection circuit. Other circuit parts of the speaker protection circuit are the same as those in Embodiment 1, and will not be repeated here. In this example, if image 3 As shown, the switch control circuit includes a third NPN transistor Q3 and a fourth PNP transistor Q4, the base of the third NPN transistor Q3 is connected to the output terminal of the OR circuit U3, and the third The emitter of the NPN transistor Q3 is connected to the ground, the collector of the third NPN transistor Q3 is connected to the base of the fourth PNP transistor Q4, and the collector of the fourth PNP transistor Q4 is connected to the DC One of the emitters of the fourth PNP transistor Q4 is connected to the gates of the first PMOS transistor Q1 and the second PMOS transistor Q2 respectively. The principle of the switch control circuit in this implement...

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Abstract

The invention discloses a loudspeaker protection circuit. The loudspeaker protection circuit comprises a first switch and a second switch which are connected with two paths of differential audio frequency signal lines respectively, of a loudspeaker, and further comprises a comparing circuit used for comparing whether two paths of differential audio frequency signals are the same or not, and a switch control circuit connected with the comparing circuit, wherein the comparing circuit sends a comparing signal to the switch control circuit, the switch control circuit generates control signals according to the comparing signal and sends the control signals to the first switch and the second switch, and the control signals are used for controlling the turn-on state of the first switch and the turn-on state of the second switch. According to the loudspeaker protection circuit, because the first switch and the second switch are arranged on the differential audio frequency signal lines of the loudspeaker, control commands used for controlling the first switch and the second switch are generated according to whether the two paths of differential audio frequency signals are the same or not, and therefore when the two paths of signals are different, the differential audio frequency signal transmission lines are cut off, the effect for protecting the loudspeaker is achieved, and the loudspeaker is prevented from being burnt.

Description

technical field [0001] The invention relates to a loudspeaker drive circuit, in particular to a loudspeaker protection circuit. Background technique [0002] Speakers have become an indispensable device in electronic products. Each speaker is driven by a driver chip. The function of the driver chip is to generate two AC signals with a voltage difference to drive the speaker to sound. According to the different voltages used by the chip, the drive signal Generally, it contains DC voltage, and the DC voltage difference between the two driving signals of the speaker must be 0, that is, the DC voltage contained in the two driving signals must be equal so as not to burn the speaker. If there is a DC voltage difference, the speaker will be burned . [0003] The speaker is generally connected to the circuit board of the driver chip through wires and connectors. If the wire is damaged or the signal pin of the machine is abnormal, it will cause one of the drive signals to be short-c...

Claims

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Application Information

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IPC IPC(8): H04R3/00H02H5/00
Inventor 李树鹏
Owner QINGDAO GOERTEK
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