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A low distortion Class D amplifier

A class D amplifier and low-pass filter technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve problems such as through current generation, reduce distortion, reduce radiation, and reduce volume small effect

Inactive Publication Date: 2004-09-01
李相前
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the positive and negative sides of the power switching device of the PWM wave power amplification output stage are simultaneously turned on to generate a through current, and the dead time needs to be set during the switching period, simplify the control circuit, and increase the operating frequency
Solve the problem of air-core inductance and improve the electromagnetic compatibility of the amplifier

Method used

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  • A low distortion Class D amplifier
  • A low distortion Class D amplifier
  • A low distortion Class D amplifier

Examples

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Embodiment Construction

[0016] figure 2 It is a circuit diagram of an embodiment of a self-excited class D amplifier. In the figure, the amplifier A1 and the capacitor C1 form a feedback integrator. The output of the integrator is sent to the comparator A2, and the output is sent to the second integrator composed of the amplifier A3 and the capacitor C2. , the output of the second integrator is coupled to the input terminal of the comparator after being low-pass filtered by the resistor R6 and the capacitor C3. The PWM wave output by the comparator is limited by diodes D5 and D6, low-pass filtered by resistor R8 and capacitor C4, and then coupled to the input terminal of the comparator by resistor R9 to compensate for the distortion of the amplifier. Adjusting resistor R9 minimizes distortion. A hysteresis control circuit is connected between the output of the comparator and the positive input, so that the hysteresis voltage that is positively fed back to the input of the comparator decreases with ...

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PUM

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Abstract

The invention adds return difference control circuit into the regenerative loop of comparator, connects the second integrating device between the original negative feedback integrating device and the comparator, the sampling point of the negative feedback is at the output end of the first grade Butterworth filter of the output grade low pass filter, and adds in the skewness correcting circuit, and the skewness and radiation are decreased greatly.

Description

Technical field [0001] The present invention relates to a class D amplifier. It is used for power amplification of signals, especially audio signals. technical background [0002] Existing class D amplifiers include self-excited and other-excited types. The self-excited class D amplifier includes a comparator with a positive feedback loop, an integrator, a PWM wave power amplifier output stage and an output low-pass filter. The PWM wave output by the power output stage is added to the input signal, and fed back to the comparator with positive feedback loop through the integrator to modulate the PWM wave. The operating frequency of the existing self-excited class D amplifier is affected by the input voltage, the frequency deviation is too large, and the distortion is increased. It excites the class D amplifier including a triangular wave generator, a comparator, an integrator, a PWM wave power amplification output stage and an output low-pass filter. The PWM wave output by...

Claims

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Application Information

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IPC IPC(8): H03F1/34H03F3/217
Inventor 李相前
Owner 李相前
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