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Vehicle power amplifying circuit

A power amplifier circuit and resistor technology, which is applied in the direction of power amplifiers, etc., can solve the problems of unsatisfactory sound and auditory effects of high-power power amplifier chips, inconsistent signal quality in different frequency bands, and limited driving ability, so as to increase the driving ability of audio signals, The effect of simple structure and low cost

Inactive Publication Date: 2011-04-20
ZHEJIANG DAHUA TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because high-power power amplifiers need to achieve ideal working conditions, the signal input terminal needs to be driven by a large current, especially the current general-purpose class D power amplifier chips. Inconsistent, some frequency bands have relatively large attenuation
And because the original signal is not processed, the high-frequency and low-frequency sound output by the high-power power amplifier chip is not ideal for hearing.

Method used

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  • Vehicle power amplifying circuit
  • Vehicle power amplifying circuit

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Embodiment Construction

[0007] The invention adds a positive feedback op-amp circuit between the small analog audio signal after the analog-to-digital conversion and the high-power power amplifier. The positive feedback operational amplifier circuit can provide sufficient current drive capability in the full frequency band, so as to ensure that the audio signal with enhanced drive capability can drive the high-power power amplifier chip in the entire effective frequency band. Since capacitors with different capacitances have different frequency characteristics when used as DC blocking capacitors, capacitors with small capacitances have better high-frequency characteristics, and capacitors with large capacitances have better low-frequency characteristics. In this scheme, both large and small capacitors are used Capacitors with different characteristics are used in parallel as a DC blocking circuit to optimize the circuit's processing of high-frequency and low-frequency audio signals. Since the human e...

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Abstract

The invention discloses a vehicle power amplifying circuit, mainly comprising seven resistors R1-R7, eight capacitor C1-C8, a operational amplifier chip U1 and a power amplifying chip. The inventive vehicle power amplifying circuit can effectively increase the audio signal drive capacity, improve the high frequency and low frequency hearing effect, has few electronic components and simple structure and low cost, is suitable for most of vehicle power amplifying circuit.

Description

technical field [0001] The invention relates to a vehicle-mounted power amplifier circuit, in particular to a vehicle-mounted power amplifier circuit capable of enhancing the drive capability of audio signals and improving high-frequency and low-frequency auditory effects. Background technique [0002] At present, the power amplifier circuit of the audio output of the electronic equipment with playback function in the car is usually directly connected to the high-power power amplifier chip by the audio signal after the digital-to-analog conversion in the previous stage, and the signal input terminal of the high-power power amplifier is directly driven by the small analog audio signal. Because high-power power amplifiers need to achieve ideal working conditions, the signal input terminal needs to be driven by a large current, especially the current general-purpose class D power amplifier chips. Inconsistent, some frequency bands have relatively large attenuation. And because...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/20
Inventor 殷俊傅利泉张兴明
Owner ZHEJIANG DAHUA TECH CO LTD