Pulse Width Modulation Circuit, Electronic System and Generation Method of Pulse Width Modulation Voltage

Abstract

The invention relates to a pulse width modulation circuit, a relevant electronic system and a generation method of a pulse width modulation voltage, wherein the pulse width modulation circuit comprises a control unit, an analog-digital converter and a digital-analog converter, wherein the control unit is provided with a reference input end coupled with a reference voltage, and a feedback input end coupled with a feedback voltage; the control unit is used for comparing the feedback voltage with a reference voltage to output a pulse width modulation voltage; a sensing node is arranged on a path of transmitting the pulse width modulation voltage; and the analog-digital converter is provided with a voltage input end and can be coupled to the sensing node so that the pulse width modulation voltage is converted into digital voltage data and the digital voltage data is transmitted to the digital-analog converter, and the digital-analog converter is sued for converting the digital voltage data into an analog voltage signal to be used as the feedback voltage. Because the pulse width modulation voltage is converted into the digital voltage data and then the digital voltage data is transmitted without easy distortion due to interference during long-distance transmission, the accurate pulse width modulation voltage can be output.

Description

technical field [0001] The present invention relates to a signal transmission technology, and in particular to a signal transmission technology of a pulse width modulation circuit. Background technique [0002] figure 1 It is shown as a block diagram of an existing pulse width modulation circuit. Please refer to figure 1 , the existing pulse width modulation circuit 100 includes a phase comparator 102 and a charge pump circuit 104 . The phase comparator 102 can be coupled to the reference voltage V ref and the feedback voltage V fb . Therefore, the phase comparator 102 can take the feedback voltage V fb with reference voltage V ref The phases of the two are compared to generate a control voltage V sw to the charge pump circuit 104. At this time, the charge pump circuit 104 can be based on the control voltage V sw while generating a pulse width modulated voltage V pwm . Also, at the PWM voltage V pwm There is a sensing node SN1 on the transmission path of , which...

AI Technical Summary

Problems solved by technology

[0006] In addition, the present invention further provides a method for generating a pulse width modulation voltage, which can solve the problem of phase shift of the feedback voltage caused by long-distance transmission

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