Power amplifier self-adaptive power matching circuit
A matching circuit and self-adaptive technology, applied in the layout of amplifier protection circuits, improving amplifiers to improve efficiency, amplifiers, etc., can solve problems such as narrow application range, user property loss, power amplifier, speaker burnout, etc., to improve stability and Safety, burn prevention effect
Pending Publication Date: 2021-04-30
GUANGZHOU BAOLUN ELECTRONICS CO LTD
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Problems solved by technology
[0002] The power amplifiers in the existing market have a relatively narrow range of application to the load impedance. Overcurrent protection is likely to occur after the rated power of the power amplifier is exceeded, or the user mistakenly connects the speaker that does not match the load of the power amplifier directly to the power amplifier, that is, due to the power amplifier The output power cannot be adaptively matched according to the load speakers, resulting in burnout of power amplifiers and speakers, causing property losses to users
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[0025] Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.
[0026] Such as Figure 1-Figure 7 As shown, a power amplifier adaptive power matching circuit includes an input attenuation control circuit, an input buffer circuit, a hysteresis comparison circuit, a temperature compensation drive circuit and a current mutual inductance rectification filter circuit. The input terminal of the input attenuation control circuit is connected with an external audio source, that is, the external audio source is input into the input attenuation control circuit, the output terminals of the input attenuation control circuit are respectively connected with the input terminals of the input buffer circuit, and the output terminals of the input buffer circuit are respectively It is connected with the hysteresis comparison circuit and the input terminal of the power amplifier, and the output terminal of the hysteresis comp...
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The invention discloses a power amplifier self-adaptive power matching circuit, which comprises an input attenuation control circuit, an input buffer circuit, a hysteresis comparison circuit, a temperature compensation driving circuit and a current mutual inductance rectification filter circuit, wherein an input end of the input attenuation control circuit is connected with an external sound source, an output end of the input attenuation control circuit is respectively connected with an input end of the input buffer circuit, an output end of the input buffer circuit is respectively connected with input ends of the hysteresis comparison circuit and a power amplifier, an output end of the hysteresis comparison circuit is connected with an input end of the input attenuation control circuit, an output end of the power amplifier is connected with an external load, an output end of the power amplifier is further connected with an input end of the current mutual inductance rectification filter circuit, an output end of the current mutual inductance rectification filter circuit is connected with an input end of the temperature compensation drive circuit, and an output end of the temperature compensation drive circuit is connected with an input end of the hysteresis comparison circuit. According to the power amplifier self-adaptive power matching circuit, the maximum output power can be adjusted by self-adaptively matching the load in a very wide range, and the stability and safety of the circuit are improved.
Description
technical field [0001] The invention relates to the technical field of power amplifier output power control circuits, in particular to a power amplifier adaptive power matching circuit. Background technique [0002] The power amplifiers in the existing market have a relatively narrow range of application to the load impedance. Overcurrent protection is likely to occur after the rated power of the power amplifier is exceeded, or the user mistakenly connects the speaker that does not match the load of the power amplifier directly to the power amplifier, that is, due to the power amplifier The output power cannot be adaptively matched according to the load speakers, resulting in burnout of power amplifiers and speakers, causing property losses to users. Therefore, it is necessary to protect the power amplifier and the load connected to the power amplifier through the adaptive matching circuit of the output power of the power amplifier, so that the power amplifier can adjust the...
Claims
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IPC IPC(8): H03F1/56H03F1/52H03F1/26H03F1/02
CPCH03F1/0205H03F1/26H03F1/52H03F1/565
Inventor 朱正辉张常华赵定金明德
Owner GUANGZHOU BAOLUN ELECTRONICS CO LTD