Auxiliary power supply circuit for power amplifier
An auxiliary power supply and circuit technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, etc., can solve the problems of power amplifier supply voltage not meeting the requirements, insufficient transient response of switching power supply, music distortion, etc., and achieve improvement. Transient response, improved audio performance, the effect of high instantaneous discharge capability
Inactive Publication Date: 2018-08-07
南京舒尔斯科技有限公司
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Problems solved by technology
At present, the switching power supply of power amplifier products has its transient response adjusted according to the change of its output terminal. However, because it needs to pass through the power amplifier, the change of power amplifier output is not directly fed back to the switching power supply, so the transient response of the switching power supply is somewhat insufficient.
Moreover, the input signal of the audio power amplifier is an audio signal with indeterminate frequency and amplitude, and a signal input similar to an impulse signal will appear. At this time, the power supply voltage of the power amplifier cannot meet the requirements, resulting in distortion of the music played.
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[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without cre...
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The invention discloses an auxiliary power supply circuit for a power amplifier. The auxiliary power supply circuit is composed of a switching power supply module, a high-voltage-withstanding thin-film capacitor, a buck type switch circuit module, a control module and a power amplifier module. The switching power supply module provides power for the power amplifier module. The switching power supply module is connected with the high-voltage-withstanding thin-film capacitor by one auxiliary winding. The high-voltage-withstanding thin-film capacitor is one part of the buck type switch circuit module. The buck type switch circuit module provides power for the power amplifier module in an auxiliary manner. The control module is connected with the input terminal of the power amplifier module and a transistor of the buck type switch circuit module. The control module controls the buck type switch circuit module by the change of the input signal of the power amplifier module. According to theinvention, when the input signal changing amplitude is large, the buck type switch circuit module is driven to provide extra power for the power amplifier module, so that the transient response of the power supply module is improved and thus the audio performance of the power amplifier product is enhanced.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an auxiliary power supply circuit of a power amplifier. Background technique [0002] Switching power supply is an important part of power amplifier products, and the speed of transient response of the power supply determines the sound quality of power amplifier products. At present, the transient response of the switching power supply of the power amplifier product is adjusted according to the change of its output terminal. However, because it needs to pass through the power amplifier, the change of the power amplifier output is not directly fed back to the switching power supply, so the transient response of the switching power supply is somewhat insufficient. Moreover, the input signal of the audio power amplifier is an audio signal with indeterminate frequency and amplitude, and a signal input similar to an impulse signal will appear. At this time, the power suppl...
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Patent Timeline
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Inventor 张成张晨
Owner 南京舒尔斯科技有限公司