Power amplifier protection circuit

A technology for protecting circuits and power amplifier circuits, which is applied to the layout of amplifier protection circuits, transducer circuits, electrical components, etc. It can solve problems such as expensive speakers, speaker damage, and DC voltage inflow, so as to save replacement and maintenance costs and reduce product damage. The effect of avoiding circuit damage

Pending Publication Date: 2022-04-12
IAG GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, if the power amplifier circuit part and the speaker part are not cut off in time, a DC voltage will flow into the speaker part and burn it down.
Moreover, at the moment when the power is turned on, when the current value flowing through the power amplifier circuit part and the speaker part can reach several times the normal average current value, it will have an impact on the power grid and the equipment itself. When the output stage of the power amplifier circuit part is damaged abnormal DC signal may be delivered when the static bias shifts or the static bias occurs, causing damage to the loudspeaker
Since the speakers connected to the Hi-Fi power amplifier are relatively expensive, once damaged, it will not only increase the user's replacement and maintenance costs, but also cause hidden dangers to the user's safety.

Method used

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention, and similar component numbers in the drawings represent similar components. Apparently, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and / or col...

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PUM

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Abstract

A power amplifier protection circuit disclosed by the present invention comprises a power amplifier circuit, a loudspeaker circuit, a detection circuit, a control protection circuit and a switching circuit, the output end of the power amplifier circuit is connected with the input end of the detection circuit and the input end of the switching circuit, and the output end of the detection circuit is connected with the input end of the control protection circuit. The output end of the switching circuit is connected with the input end of the loudspeaker circuit, and the output end of the control protection circuit is connected with the control end of the switching circuit. The circuit is simple in structure and high in safety.

Description

technical field [0001] The invention relates to the technical field of power amplifiers, in particular to a power amplifier protection circuit. Background technique [0002] For Hi-Fi audio, it is necessary to connect the speaker part through the Hi-Fi power amplifier circuit part to restore the high-fidelity sound. When the part of the power amplifier circuit fails, the DC potential at the output end will often deviate from zero level, and a higher positive or negative DC voltage will appear. At this time, if the power amplifier circuit part and the speaker part are not cut off in time, a DC voltage will flow into the speaker part and burn it down. Moreover, at the moment when the power is turned on, when the current value flowing through the power amplifier circuit part and the speaker part can reach several times the normal average current value, it will have an impact on the power grid and the equipment itself. When the output stage of the power amplifier circuit part i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/52H03F3/187H04R3/00
Inventor 李振兴
Owner IAG GROUP LIMITED
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