Low-pass amplification pulse modulation system based on capacitive feedback three-point oscillating circuit

Abstract

The invention discloses a phase-shift processing based pulse modulation system by low-pass amplification. The pulse modulation system mainly comprises a peak-clipping circuit, a pulse modulation circuit and a two-stage low-pass filtering amplification circuit, wherein the pulse modulation circuit is connected with the output end of the peak-clipping circuit. The pulse modulation system is characterized in that a phase-shift processing circuit is further arranged between the pulse modulation circuit and the two-stage low-pass filtering amplification circuit and comprises a phase-shift chip U2, a triode VT3, a triode VT4, a resistor R7, a polar capacitor C4, a resistor R6 and the like, wherein one end of the resistor R7 is connected with a VCC+ pin of the phase-shift chip U2 while the other end of the resistor R7 is connected with an IN1 pin of the phase-shift chip U2, a cathode of the polar capacitor C4 is connected with the pulse modulation circuit while an anode of the polar capacitor C4 is connected with an IN2 pin of the phase-shift chip U2, and one end of the resistor R6 is connected with the pulse modulation circuit while the other end of the resistor R6 is connected with the IN1 pin of the phase-shift chip U2. The phase-shift processing based pulse modulation system by low-pass amplification has the advantage that by the aid of the phase-shift processing circuit, pulse frequency can be still kept stable when the pulse modulation system outputs high power.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a low-pass amplified pulse wave modulation system based on a capacitive feedback three-point oscillating circuit. Background technique [0002] The application of electric energy is becoming more and more popular in social production and human life, and electrical appliances that meet various requirements are also emerging. In daily life, people usually use pulse modulation circuits to power electrical appliances to meet people's use of electrical appliances. However, in actual use, when the pulse wave modulation circuit outputs high power, its pulse wave frequency is not stable, which cannot meet people's increasing electrical needs. Contents of the invention [0003] The purpose of the present invention is to overcome the defect that the pulse frequency of the traditional pulse wave circuit is not stable when outputting high power, and to provide a low-pass amplified pulse wave mod...

AI Technical Summary

Problems solved by technology

However, in actual use, when the pulse modulation circuit outputs high power, its pulse frequency is not stable, which cannot meet people's increasing electrical needs.

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