Low-pass filtering amplification peak-clipping pulse wave modulation system based on step-down type constant current

Abstract

The invention discloses a two-stage low-pass filtering and amplifying, peak clipping and pulse modulation system based on linear driving. The system mainly comprises a peak clipping circuit, a pulse modulation circuit and a two-stage low-pass filtering and amplifying circuit, wherein the pulse modulation circuit is connected with the output end of the peak clipping circuit, and the two-stage low-pass filtering and amplifying circuit is connected with the output end of the pulse modulation circuit. The system is characterized by further comprising a linear driving circuit arranged between the peak clipping circuit and the pulse modulation circuit; the linear driving circuit is composed of a driving chip U2, a triode VT5, a triode VT6, a triode VT7, a triode VT8, a polar capacitor C10, a resistor R14 and the like; the positive electrode of the polar capacitor C10 is connected with the peak clipping circuit, and the negative electrode of the polar capacitor C10 is connected with a pin IN1 of the driving chip U2 after passing through a resistor R13; one end of the resistor R14 is connected with the collector electrode of the triode VT5, and the other end of the resistor R14 is connected with the base electrode of the triode VT7 after passing through a resistor R15. Under the action of the linear driving circuit, the system can provide a stable voltage and prevent the situation that the using effect and the service life of an electric appliance are affected by an unstable voltage.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a low-pass filter amplification peak clipping pulse modulation system based on step-down constant current. 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, the output power of the pulse modulation circuit is not high, and the output voltage and current are unstable, which cannot meet people's increasing electrical needs. Contents of the invention [0003] The purpose of the present invention is to overcome the defects that the output power of the traditional pulse wave circuit is not high, the voltage and current are unstable, and cannot meet the people's increasin...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects that the output power of the traditional pulse wave circuit is not high, the voltage and current are unstable, and cannot meet the people's increasing electrical needs, and provide a low-pass filter based on a step-down constant current. wave modulation system

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