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Feedback circuit for D type power amplifier and electronic equipment

A technology of power amplifier circuit and power amplifier, which is applied in the direction of amplifiers, components of amplifier devices, amplifiers with semiconductor devices/discharge tubes, etc., and can solve problems such as high cost and complex feedback circuit design

Active Publication Date: 2014-12-10
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a feedback circuit and electronic equipment for class D power amplifiers, which are used to solve the problems of complex design and high cost of feedback circuits of existing class D power amplifiers

Method used

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  • Feedback circuit for D type power amplifier and electronic equipment
  • Feedback circuit for D type power amplifier and electronic equipment
  • Feedback circuit for D type power amplifier and electronic equipment

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0032] First of all, it should be noted that the class D power amplifier targeted by the embodiment of the present invention includes a waveform generator 101, a comparator 102, a power amplifier circuit 103, a power supply 105, and a signal generator 106. For the functions of the above-mentioned devices, please refer to figure 1 The corresponding device in it. The present invention provides a feedback circuit for the above class D power amplifier, such as Figure...

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Abstract

The invention discloses a feedback circuit for a D type power amplifier and electronic equipment and relates to the technical field of power amplifiers. The problem that a feedback circuit of an existing D type power amplifier is complex in design and high in cost is solved. The feedback circuit comprises a sampling circuit. The input end of the sampling circuit is connected with a power supply. The output end of the sampling circuit is connected with the input end of a waveform generator. The output end of the waveform generator is connected with a first input end of a comparer. A signal generator is connected with a second input end of the comparer. The output end of the comparer is connected with the input end of a power amplifying circuit. The output end of the power amplifying circuit is used for outputting signals. The sampling circuit is used for carrying out smoothing and voltage dividing on voltage output by the power supply. The voltage obtained after smoothing and voltage dividing adjusts the range generated by the waveform generator. The circuit can be used in the electronic equipment of the D type power amplifier.

Description

technical field [0001] The invention relates to the technical field of power amplifiers, in particular to a feedback circuit and electronic equipment for class D power amplifiers. Background technique [0002] Class D power amplifier (referred to as Class D power amplifier) ​​refers to Class D audio power amplifier, such as figure 1 As shown, the class D power amplifier includes a waveform generator 101, a comparator 102, a power amplifying circuit 103, a first filter circuit 104, a power supply 105 and a signal generator 106, wherein the power supply 105 is used to provide power amplifying circuit 103 Operating Voltage. [0003] Specifically, the audio input signal U generated by the signal generator 106 1 and waveform generator 101 output signal U 2 Output pulse width modulation (Pulse Width Modulation, PWM for short) signal U after comparator 102 3 , PWM signal U 3 After being amplified by the power amplifying circuit 103, the amplified PWM signal U is output 4 , th...

Claims

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Application Information

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IPC IPC(8): H03F3/217
CPCH03F3/217H03F1/0222H03F3/195H03F3/245H03F3/45475H03F2200/171H03F2200/78H03F2203/45512H03F2203/45594
Inventor 孙学斌刘进
Owner HISENSE VISUAL TECH CO LTD
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