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A Class D Audio Amplifier

A technology for audio amplifiers and generating circuits, which is applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., and can solve problems such as unimproved EMI suppression performance

Active Publication Date: 2018-01-05
NANJING SILERGY SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a class D audio amplifier to solve the problem that the EMI suppression performance of the class D audio amplifier in the prior art cannot be improved due to the fixed switching frequency and the fixed switching rate

Method used

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  • A Class D Audio Amplifier
  • A Class D Audio Amplifier
  • A Class D Audio Amplifier

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Embodiment Construction

[0045] 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 making creative efforts belong to the protection scope of the present invention.

[0046] figure 1 It is a structural block diagram of a class D audio amplifier disclosed in the embodiment of this application.

[0047] Please refer to figure 1 , The class-D audio amplifier disclosed in the embodiment of the present application includes a clock signal generation circuit 01 , a pseudo-random signal generation circuit 02 , a carrier generation circuit 03 and a driving current generation circuit 04 .

[0048] The clock signal generating circui...

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Abstract

The application provides a class D audio amplifier, which includes a carrier generation circuit, a driving current generation circuit, a pseudo-random signal generation circuit and a clock signal generation circuit. A group of pseudo-random signals are generated by a pseudo-random signal generation circuit, and a carrier signal with a pseudo-random frequency change is generated according to the pseudo-random signal, so that the PWM signal obtained through the carrier signal is also a signal with a pseudo-random change in frequency. At the same time, a driving current with pseudo-random changes in magnitude is also generated according to the pseudo-random signal. The PWM signal with a pseudo-random change in frequency and the drive current with a pseudo-random change in size make the switching frequency of the power switch tube change within a certain range, and the turn-on time and turn-off time of the switch tube change within a first range, thereby breaking up the switching frequency of the power switch tube. The spectral energy at the frequency and its multiplier reduces the peak energy, so that the class D audio amplifier has better EMI suppression performance in both low frequency band and high frequency band.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a Class D audio amplifier. Background technique [0002] Due to the advantages of high efficiency and low power consumption, Class D audio amplifiers are increasingly used in portable devices such as PDAs, mobile phones, and MP3s. [0003] In the traditional class D audio amplifier, the fixed frequency PWM signal is formed by comparing the audio input signal with the high frequency fixed frequency carrier signal, and then the formed fixed frequency PWM signal is amplified by a high voltage power MOSFET. The PWM signal is then passed through a low-pass filter to remove the carrier frequency, and the original baseband audio signal can be restored. [0004] Although this traditional Class-D audio amplifier has high operating efficiency, the switching frequency of its power device is fixed (the frequency of the PWM signal controlling the switching state of the power device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217
Inventor 曹何金生
Owner NANJING SILERGY SEMICON TECH CO LTD
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