CN208849738U - A kind of overload-resistant power amplifier - Google Patents
A kind of overload-resistant power amplifier Download PDFInfo
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- CN208849738U CN208849738U CN201821688157.8U CN201821688157U CN208849738U CN 208849738 U CN208849738 U CN 208849738U CN 201821688157 U CN201821688157 U CN 201821688157U CN 208849738 U CN208849738 U CN 208849738U
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- power amplifier
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- overload
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Abstract
The utility model provides a kind of overload-resistant power amplifier, a kind of overload-resistant power amplifier, it sequentially connects between input signal and power amplifier a signal amplitude limiting circuit and a signal attenuation circuit, one output electric current detecting circuit is electrically connected with the output end of power amplifier respectively with the input terminal of an output voltage detecting circuit, output end is connect with an output impedance computing circuit respectively, the output end for wherein exporting electric current detection is also electrically connected with the input terminal of signal attenuation circuit, and the output end of power amplifier is electrically connected with loudspeaker.The utility model can effectively protect power amplifier, effectively improves the anti-overload ability of power amplifier.
Description
Technical field
The utility model relates to a kind of power amplifiers, refer in particular to a kind of overload-resistant power amplifier.
Background technique
Existing power amplifier (audio power amplifier) is excessive or loaded in volume by sampling to the real-time transient state of output electric current
Wait again under the conditions of, when power amplifier output electric current reaches setting threshold values, meeting volitional check electric current is allowed to not be further added by, " cut into electric current
Peak " state protects the power tube of power amplifier to be unlikely to damage.But after existing power amplifier enters " peak clipping " state, distortion is rapid
Increase, sound is very unpleasant to hear, and may burn loudspeaker.
Utility model content
The utility model proposes a kind of overload-resistant power amplifiers for caning effectively protect power amplifier.
The technical solution of the utility model is achieved in that
A kind of overload-resistant power amplifier, sequentially connect a signal amplitude limiting circuit and one between input signal and power amplifier
Signal attenuation circuit, an output electric current detecting circuit and the input terminal of an output voltage detecting circuit are defeated with power amplifier respectively
Outlet electrical connection, output end connect with an output impedance computing circuit respectively, wherein export the output end of electric current detection also with letter
The input terminal electrical connection of number attenuator circuit, the output end of power amplifier are electrically connected with loudspeaker.
Overload-resistant power amplifier provided by the utility model passes through output electric current detection output impedance computing circuit control letter
The frequency band and amplitude of number amplitude-limiting circuit, and then adjust volume and frequency band, that is, pass through the defeated of signal attenuation circuit control power amplifier
Voltage out, and then output circuit is adjusted, form current control closed loop.Power amplifier, which can be effectively reduced, by this circuit enters electric current
" peak clipping " state, theoretically, output electric current reduce one times, and sound pressure level reduces 6 decibels, it is subjective acoustically, only sound is slightly
It is smaller, but effectively prevent the unpleasant to hear of sound.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the connection figure of the overload-resistant power amplifier of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Figure 1, a kind of overload-resistant power amplifier, a signal amplitude of sequentially connecting between input signal and power amplifier limit
Circuit processed and a signal attenuation circuit, one output electric current detecting circuit and an output voltage detecting circuit input terminal respectively with function
The output end electrical connection on electric discharge road, output end are connect with an output impedance computing circuit respectively, wherein output electric current detection is defeated
Outlet is also electrically connected with the input terminal of signal attenuation circuit, and the output end of power amplifier is electrically connected with loudspeaker.
In the present invention, the electricity on power amplifier can be read in output electric current detecting circuit and output voltage detecting circuit
Pressure, and it is sent to impedance op circuit, the design impedance ratio of the impedance and power amplifier that are loaded by impedance op circuit counting
Compared with, then the ratio of overload is calculated, frequency band and the decaying of amplitude fading device can be accurately controlled when signal arrives preset ratio greatly
Voltage of PA reduces output electric current.By the above measure, effectively reduces power amplifier and enter electric current " peak clipping " state.Usually
According to industry theory, output electric current reduces one times, and sound pressure level reduces 6 decibels, it is subjective acoustically, only sound is slightly small by one
A bit, but the unpleasant to hear of sound is effectively prevented, effectively improves the anti-overload ability of power amplifier.
It preferably, further include a transformer temperature sample circuit and a power tube temperature sampling circuit, transformer temperature is adopted
Sample circuit and power tube temperature sampling circuit are electrically connected with signal attenuation circuit.It acts as temperature sampling circuits in power amplifier
The higher device of the temperature rises such as power tube and power transformer carries out temperature sampling, thus the adjustment signal decaying according to temperature height
Circuit, in overtemperature reduce sound output, and simultaneously adjust accelerate power amplifier radiator fan revolving speed to reduce power amplifier internal temperature,
It can restore sound output.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (2)
1. a kind of overload-resistant power amplifier, which is characterized in that a signal amplitude of sequentially connecting between input signal and power amplifier limit
Circuit processed and a signal attenuation circuit, one output electric current detecting circuit and an output voltage detecting circuit input terminal respectively with function
The output end electrical connection on electric discharge road, output end are connect with an output impedance computing circuit respectively, wherein output electric current detection is defeated
Outlet is also electrically connected with the input terminal of signal attenuation circuit, and the output end of power amplifier is electrically connected with loudspeaker.
2. overload-resistant power amplifier as described in claim 1, which is characterized in that further include a transformer temperature sample circuit and
One power tube temperature sampling circuit, transformer temperature sample circuit and power tube temperature sampling circuit are electrically connected with signal attenuation circuit
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821688157.8U CN208849738U (en) | 2018-10-17 | 2018-10-17 | A kind of overload-resistant power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821688157.8U CN208849738U (en) | 2018-10-17 | 2018-10-17 | A kind of overload-resistant power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208849738U true CN208849738U (en) | 2019-05-10 |
Family
ID=66376270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821688157.8U Active CN208849738U (en) | 2018-10-17 | 2018-10-17 | A kind of overload-resistant power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208849738U (en) |
-
2018
- 2018-10-17 CN CN201821688157.8U patent/CN208849738U/en active Active
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