Audio power amplifier and method for switching audio power amplifying modes
A technology of audio power and amplifier, applied in the field of electronic circuit design, can solve problems such as unsatisfactory and different
Active Publication Date: 2014-04-09
ACTIONS ZHUHAI TECH CO
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Problems solved by technology
[0006] At present, actual audio products have various and more complex functions (such as portable multimedia speakers, portable MP3, etc.), and EMI, The requirements for power consumption are different. If you choose Class AB power amplifier or Class D power amplifier for audio power amplifier processing for this type of electronic products, it may meet the requirements of some functions for EMI and power consumption, while for other functions, the requirements for EMI and power consumption will be satisfied. Power dissipation requirements are not met
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[0030] In order to meet the requirements of electronic products for power consumption and EMI in different functional modes, an embodiment of the present invention provides an audio power amplifier, which includes: a preamplifier unit, a switch array unit, a Class AB drive unit, a Class D modulation unit, output selection unit and power output unit; the external logic control port (ie S_MOD) controls the switch array unit and the output selection unit to select the Class AB drive unit according to the current functional mode of the electronic product to the power consumption and EMI indicators Or Class D modulation unit for audio power amplifier processing. Using the audio power amplifier provided by the embodiment of the present invention, different audio power amplifier modes in the audio amplifier can be selected for audio power amplifier processing according to the requirements of electronic products on EMI and power consumption in different functional modes.
[0031] The te...
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An audio power amplifier and a method for switching audio power amplification modes, performing switching of power amplification modes to meet requirements of electronic products for power consumption and electromagnetic interference (EMI) in different function modes. The method involves: when a device in which a power amplifier exists determines that the power consumption corresponding to the function mode that the device is currently in is lower than a power consumption threshold, a switch array unit (2) is indicated switching on a Class AB drive unit (3); when it is determined that the power consumption is greater than or equal to the power consumption threshold, and a function unit being more sensitive to EMI has been turned on, a control signal for indicating switching on the Class AB drive unit (3) is sent to the switch array unit (2); when it is determined that the power consumption is greater than or equal to the power consumption threshold, and none of function units being more sensitive to EMI has been turned on, the switch array unit (2) is indicated switching on a Class D modulation unit (4).
Description
technical field [0001] The invention relates to the field of electronic circuit design, in particular to an integrated circuit audio power amplifier and a method for switching audio power amplifier modes by using the audio power. Background technique [0002] The audio power amplifier is an essential device for audio back-end processing. Its main function is to amplify the audio signal and output it to the terminal receiver, such as earphones, speakers, etc. At present, audio power amplifiers are divided into two categories according to their working modes: one is Class AB power amplifiers, and the other is Class D power amplifiers. [0003] Class D power amplifiers such as figure 1 As shown, the output is a discrete signal, and the power tube of the Class D power amplifier works in the switch state. Using the Class D power amplifier for audio power amplification has a high output efficiency, but because the output signal has a large transient amplitude Potential changes, ...
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IPC IPC(8): H03F3/20H03K17/567
CPCH03F3/217
Inventor 熊江唐晓
Owner ACTIONS ZHUHAI TECH CO