Square-wave pulse driving waveform modulation circuit

Abstract

The invention provides a square-wave pulse driving waveform modulation circuit. The waveform modulation circuit comprises a basic square-wave source, a D trigger, an intermediate modulation module, a control module and a final modulation module, wherein the basic square-wave source is used for outputting a square-wave driving pulse CLK with adjustable frequency and duty cycle; the D trigger is used for modulating the square-wave driving pulse CLK into two square-wave pulses with completely opposite polarities, namely AU-1 and BU-1; the intermediate modulation module is used for modulating AU-1 and BU-1 into AU-2 and BU-2 respectively; the control module is used for modulating AU-1 and BU-1 into AD and BD respectively; the final modulation module is used for modulating AU-2 into a third control waveform AU under the control of SD and modulating BU-2 into a fourth control waveform BU under the control of AD. As the square-wave pulse driving waveform modulation circuit mainly comprises a logic gate circuit and RC elements, once parameters are determined, a group of basic square-wave sources can be stably and reliably modulated into driving waveforms of power devices on four groups of H-bridge arms, and accordingly, stronger anti-interference ability is achieved; all parameters of the H-bridge square-wave pulse can be flexibly adjusted so long as one group of basic square-wave sources are controlled, so that the realization of modular design is facilitated.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to a bipolar pulse modulation circuit, in particular to a square wave pulse drive waveform modulation circuit. Background technique [0002] Such as figure 1 As shown, the H-bridge circuit is composed of four groups of power devices Au, Ad, Bu, and Bd, and out1 and out2 are output terminals. The H-bridge circuit can be used to generate bipolar square wave pulses, and it is necessary to control the coordinated switching actions of four groups of power devices respectively, and a total of four groups of driving waveforms are required; the four groups of driving waveforms control and determine the output square wave pulse of the H-bridge circuit. Frequency (period), duty cycle, positive and negative polarity waveform interval (△t). The bipolar square wave pulse output by the existing H-bridge circuit such as figure 2 As shown, a period T contains two square waves t1 and t...

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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a square wave pulse drive waveform modulation circuit, which is used to solve the problem of complex and inflexible control of the drive pulse of the H bridge circuit in the prior art

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