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D-class power amplifier with novel PWM (Pulse-Width Modulation) circuit

A PWM circuit and power amplifier technology, applied in the electronic field, can solve problems such as complex circuits, noise interference, modulation errors, etc., and achieve the effect of strong anti-interference ability and simple structure

Inactive Publication Date: 2012-02-15
成都云溯新起点科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional class D power amplifier has complex circuits and is seriously disturbed by noise due to the comparator and the oscillator outputting the sawtooth wave or triangular wave
When the slope of the output signal of the integrator changes, the PWM wave output may output two pulses in one cycle, resulting in modulation errors

Method used

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  • D-class power amplifier with novel PWM (Pulse-Width Modulation) circuit
  • D-class power amplifier with novel PWM (Pulse-Width Modulation) circuit
  • D-class power amplifier with novel PWM (Pulse-Width Modulation) circuit

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Embodiment Construction

[0010] Existing technologies such as figure 1 , the circuit consists of an integrator, a comparator 2 and an output stage 3. The integrator consists of amplifier 1 and capacitor 8. The capacitor 8 is connected to the output terminal of the amplifier 1 and the inverting input terminal. The inverting input terminal of amplifier 1 is the input terminal of the integrator, and the output terminal is the output terminal of the integrator. The integrator is connected to the input terminal INPUT of the system through a resistor 16 . The inverting input terminal of the comparator 2 is directly connected to the output terminal of the amplifier 1 , and the positive input terminal is connected to the output terminal of the oscillator 17 . The input of the output stage 3 is connected to the output terminal of the comparator 2, and the output terminal is the output terminal OUTPUT of the system. The output of the system is connected to a filter 4 and the output of the filter is connecte...

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PUM

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Abstract

The invention provides a D-class power amplifier with a novel PWM (Pulse-Width Modulation) circuit, which relates to electron technology. The D-class power amplifier with the novel PWM circuit comprises an integrator, a PWM circuit and an output stage, wherein the input end of the integrator is connected with a system input end, the output end of the integrator is connected with the control end of the PWM circuit, the input end of the PWM circuit is connected with a clock signal, and the output end of the PWM circuit is fed back to the input end of the integrator through the output stage. Theinvention has simple structure, is suitable for large-scale digital integration, does not need an internal oscillator to generate saw-tooth waves or triangular waves and has strong disturbance resistance capacity.

Description

technical field [0001] The present invention relates to electronic technology. Background technique [0002] Class D power amplifiers, also known as PWM (Pulse Width Modulation) amplifiers, can be used to amplify audio signals. Class D power amplifiers usually include an integrator and a comparator. The output of the integrator is compared with the sawtooth wave or triangle wave output by the oscillator, and a PWM wave is output. The traditional Class D power amplifier contains a comparator and an oscillator that outputs a sawtooth wave or a triangular wave, the circuit is complex and is seriously disturbed by noise. When the slope of the output signal of the integrator changes, the PWM wave output may output two pulses in one cycle, resulting in modulation errors. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a new class D amplifier with strong anti-interference performance. [0004] The technical solution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217
Inventor 李文昌于廷江黄国辉向本才
Owner 成都云溯新起点科技有限公司