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A kind of feedback circuit and electronic equipment for d class power amplifier

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: 2017-07-07
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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  • A kind of feedback circuit and electronic equipment for d class power amplifier
  • A kind of feedback circuit and electronic equipment for d class power amplifier
  • A kind of feedback circuit and electronic equipment for d class power amplifier

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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 and electronic equipment for class D power amplifiers, relates to the technical field of power amplifiers and is used to solve the problems of complex design and high cost of the feedback circuit of the existing class D power amplifiers. Wherein, the feedback circuit includes a sampling circuit; the input end of the sampling circuit is connected to the power supply, the output end is connected to the input end of the waveform generator, the output end of the waveform generator is connected to the first input end of the comparator, and the signal generator is connected to the comparator The second input terminal of the comparator is connected, the output terminal of the comparator is connected with the input terminal of the power amplifier circuit, and the output terminal of the power amplifier circuit is used for outputting signals; wherein, the sampling circuit is used for filtering and dividing the voltage output by the power supply , the filtered and divided voltage adjusts the amplitude of the waveform generated by the waveform generator. The circuit provided by the invention can be used in electronic equipment using class D power amplifiers.

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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Patent Type & Authority Patents(China)
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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