Audio frequency PWM modulation circuit and sound equipment
A modulation circuit and audio technology, applied in the electronic field, can solve problems such as power amplifier output power instability, reduced power amplifier conversion efficiency, and increased EMC processing difficulty
Active Publication Date: 2016-07-27
TCL TECH ELECTRONICS (HUIZHOU) CO LTD
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Problems solved by technology
[0002] At present, the audio PWM modulation circuit of the power amplifier has been integrated in the IC, and its operating frequency reaches above 200K. For some special high-voltage power amplifiers, the higher operating frequency will reduce the conversion efficiency of the power amplifier and increase the difficulty of EMC processing (EMC , electromagnetic compatibility, electromagnetic compatibility refers to the ability of a device or system to operate in compliance with the requirements in its electromagnetic environment and not cause unbearable electromagnetic interference to any equipment in its environment); and, the audio PWM of most power amplifiers currently on the market Modulation ICs are all open-loop. When the input voltage of the power amplifier changes (that is, when the main power supply voltage of the power amplifier changes), the output power of the power amplifier will be unstable.
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[0035] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0036] The invention provides an audio frequency PWM modulation circuit.
[0037] refer to figure 1 , figure 1 It is a schematic diagram of the module structure of an embodiment of the audio PWM modulation circuit of the present invention.
[0038] The audio PWM modulation circuit 100 of this embodiment includes a working voltage input end 101, an audio signal input end 102, an audio PWM modulation signal output end 103, a main power supply voltage compensation circuit 104, a sawtooth wave generator circuit 105, and an audio PWM comparator circuit 106 and Main supply voltage input terminal 107 .
[0039] Wherein, the working voltage input terminal 101 is respectively connected to the power input terminal V1 of the main power supply voltage compensation circuit 104, the first power input terminal V21 of the sawtooth...
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The invention discloses an audio frequency PWM modulation circuit comprising a main power supply voltage input end, a working voltage input end, an audio frequency signal input end, an audio frequency PWM modulation signal output end, a main power supply voltage compensation circuit, a sawtooth wave generator circuit, and an audio frequency PWM comparator circuit. The sawtooth wave generator circuit is used to generate sawtooth wave voltage signals. The audio frequency PWM comparator circuit is used to generate reference voltage signals, is used to compare the reference voltage signals with the sawtooth wave voltage signals to generate the PWM modulation fundamental wave signals, and then is used to modulate the audio frequency signals of the audio frequency signal input end to acquire the audio frequency PWM modulation signals. The audio frequency PWM modulation signal output end is used to output the audio frequency PWM modulation signals to the power driving module of the power amplifier. The main power supply voltage compensation circuit is used to stabilize the output power of the power driving module of the power amplifier. The output power of the power driving module of the power amplifier can be stabilized.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an audio frequency PWM modulation circuit and audio equipment. Background technique [0002] At present, the audio PWM modulation circuit of the power amplifier has been integrated in the IC, and its operating frequency reaches above 200K. For some special high-voltage power amplifiers, the higher operating frequency will reduce the conversion efficiency of the power amplifier and increase the difficulty of EMC processing (EMC , electromagnetic compatibility, electromagnetic compatibility refers to the ability of a device or system to operate in compliance with the requirements in its electromagnetic environment and not cause unbearable electromagnetic interference to any equipment in its environment); and, the audio PWM of most power amplifiers currently on the market Modulation ICs are all open-loop. When the input voltage of the power amplifier changes (that is, when the m...
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IPC IPC(8): H03K7/08H04R3/00
Inventor 刘志成陈航科
Owner TCL TECH ELECTRONICS (HUIZHOU) CO LTD