TWI456901B - Pwm circuit, electronic system, and method for generating pwm voltage - Google Patents

Claims (10)

A pulse width modulation circuit includes: a control unit having a reference input coupled to a reference voltage, and a feedback input coupled to a feedback voltage, the control unit is configured to compare the feedback a voltage and the reference voltage to output a pulse width modulation voltage, wherein a sensing node is located on a path for transmitting the pulse width modulation voltage; an analog digital converter having a voltage input coupled to the sensing a node, configured to obtain the pulse width modulation voltage from the sensing node, and convert the pulse width modulation voltage into a digital voltage data; and a digital analog converter coupled to the analog digital converter and the control unit, Receiving the digital voltage data, and converting the digital voltage data into an analog voltage signal, as the feedback voltage is returned to the control unit. The pulse width modulation circuit of claim 1, wherein the analog digital converter and the digital analog converter have a clock terminal, and the two clock terminals are coupled to the same clock signal. The pulse width modulation circuit of claim 1, further comprising a conducting component coupled between the voltage input terminal and the sensing node. An electronic system comprising: a main circuit, operating according to a pulse width modulation voltage; a first circuit module coupled to the main circuit, and the first circuit module having: a control unit having a coupling a reference input terminal of the reference voltage, and a feedback input coupled to a feedback voltage, wherein the control unit is configured to compare the feedback voltage with the reference voltage to output the pulse width modulation voltage to the main a circuit, wherein a sensing node is located on a path for transmitting the pulse width modulation voltage; and a digital analog converter having a data input terminal for receiving a digital voltage data and converting the digital voltage data into an analog voltage The signal is transmitted back to the control unit as the feedback voltage; and a second circuit module is coupled to the first circuit module and the sensing node, and the second circuit module has: an analogous digit The converter has a voltage input end coupled to the sensing node, and converts the pulse width modulation voltage into the digital voltage data to output the digital voltage data from a data output terminal to the digital analog converter The electronic system of claim 4, further comprising a data transmission module coupled to the data output end of the digital analog converter and the data input end of the digital analog converter for transmitting the digital voltage data . The electronic system of claim 5, wherein the analog-to-digital converter and the digital-to-analog converter both have a clock terminal, and the two clock terminals are coupled to the same clock signal. The electronic system of claim 4, wherein the main circuit is directly disposed on the first circuit module. The electronic system of claim 4, wherein the main circuit is directly disposed on the second circuit module. A method for generating a pulse width modulation voltage includes the steps of: intercepting a feedback voltage; comparing a phase of the feedback voltage with a phase of a reference voltage, and generating the pulse width modulation voltage according to the comparison result; The pulse width modulates the voltage and converts it into a digital voltage data; and converts the digital voltage data into an analog voltage signal, and uses the analog voltage signal as the feedback voltage. The method for generating the method of claim 9 further includes the step of transmitting the digital voltage data through a data transmission path.