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Power amplifier and input signal adjusting method

A technology for power amplifiers and input signals, applied in the direction of amplifier input/output impedance improvement, amplifiers, differential amplifiers, etc., can solve the problem that class D amplifiers are difficult to perform constant voltage drive, large internal impedance value, and class D amplifiers cannot properly perform functions And other issues

Active Publication Date: 2016-09-28
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, power supplies for vacuum tube amplifiers have larger internal impedance values ​​than those for class D amplifiers
When such a power supply with high internal impedance is used for a class D amplifier, there arises a problem that it is difficult for the class D amplifier to perform constant voltage driving, and thus the class D amplifier cannot perform its function properly

Method used

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  • Power amplifier and input signal adjusting method
  • Power amplifier and input signal adjusting method
  • Power amplifier and input signal adjusting method

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Embodiment Construction

[0021] Embodiments of the present disclosure will be described below with reference to the drawings. figure 1 is a circuit diagram showing the configuration of a power amplifier according to an embodiment of the present disclosure. To facilitate the understanding of power amplifier 1, the figure 1 The loudspeaker SP which is the load of the power amplifier 1 is shown in .

[0022] Such as figure 1 As shown in , the power amplifier 1 includes an input signal supplier 50 , a class D amplifier 100 , a load current feedback circuit 200 and a filter current feedback circuit 300 .

[0023] The input signal supplier 50 is a circuit for performing amplitude adjustment on the audio signal AIN input to the power amplifier 1, and thereby supplying the input signal AIN' to the class D amplifier 100. The power amplifier 1 according to the embodiment may be used as an electric guitar amplifier, and in this case, an output signal of the electric guitar is supplied to the input signal supp...

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PUM

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Abstract

A power amplifier and an input signal adjusting method are provided; the power amplifier includes a class-D amplifier and an input signal supplier. The class-D amplifier includes an input portion and a switching device. The switching device is switched according to an input signal that is input to the input portion so that a current is supplied to a load from a power source via the switching device. The input signal supplier supplies the input signal to the input portion of the class-D amplifier, calculates a virtual output voltage to be output from a virtual power source having a prescribed internal impedance characteristic when a current to flow through the load is output from the virtual power source, and adjust an amplitude of the input signal according to the virtual output voltage.

Description

technical field [0001] The present disclosure relates to a power amplifier and a method of input signal conditioning, and more particularly to a power amplifier suitable for use as a guitar amplifier. Background technique [0002] In recent years, power amplifiers using semiconductor devices, such as class D amplifiers, have come into widespread use as audio power amplifiers. For example, in a class D amplifier, an output stage transistor is switched on / off according to a PWM pulse train generated by pulse width modulation of an input audio signal, and current is supplied from a power supply to a speaker via the output stage transistor. Class D amplifiers are able to efficiently deliver power to speakers because they have very low output impedance and therefore very low losses in the output stage transistors. More specifically, although the impedance of the speaker is 8 to 16Ω, the output impedance of the class D amplifier is approximately equal to 0Ω. [0003] Also, in a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/56H03F3/217H03F3/45H03G3/30
CPCH03F1/56H03F3/217H03F3/45076H03F2200/03H03F2200/351H03G3/3005
Inventor 大谷洋平野吕正夫
Owner YAMAHA CORP