Equivalent series resistance compensation circuit, constant-frequency turn-on circuit and voltage conversion device

A constant-frequency turn-on circuit, comprising:

• an equivalent series resistance compensation circuit, comprising:
• a low-pass filter, configured to perform a low-pass filtering on a first clock signal with a first duty period to generate a first sensing voltage, and performing the low-pass filtering on a second clock signal with a second duty period to generate a second sensing voltage,
• wherein the first clock signal and the second clock signal have the same period, and a sum of the first duty period and the second first duty period is 1;
• a voltage divider, electrically connected to the low-pass filter, configured to generate a first control voltage based on the first sensing voltage and a constant internal bias voltage, and generate a second control voltage based on the second sensing voltage and the constant internal bias voltage,
• wherein the first control voltage is generated by dividing the constant internal bias voltage by the first duty period, and the second control voltage is generated by dividing the constant internal bias voltage by the second duty period;
• and
• a compensator, electrically connected to the voltage divider, and configured to generate a ramp voltage signal based on the first control voltage and the second control voltage,
• wherein the equivalent series resistance compensation circuit outputs the ramp voltage signal, the constant internal bias voltage and the first sensing voltage;
• a comparator, electrically connected to the equivalent series resistance compensation circuit, and configured to generate a comparison result by comparing the constant internal bias voltage with the ramp voltage signal and comparing a reference voltage with a feedback voltage;
• a turn-on time signal generator, electrically connected to the comparator and the equivalent series resistance compensation circuit,
• wherein the turn-on time signal generator generates a turn-on time signal based on the comparison result and the first sensing voltage;
• and
• a driving circuit, electrically connected to the turn-on time signal generator, and configured to generate the first clock signal, the second clock signal and a driving signal based on the turn-on time signal.

A voltage conversion device, comprising:

• a constant-frequency turn-on circuit, comprising:
• an equivalent series resistance compensation circuit, comprising:
• a low-pass filter, configured to perform a low-pass filtering on a first clock signal with a first duty period to generate a first sensing voltage, and performing the low-pass filtering on a second clock signal with a second duty period to generate a second sensing voltage, wherein the first clock signal and the second clock signal have the same period, and wherein a sum of the first duty period and the second first duty period is 1;
• a voltage divider, electrically connected to the low-pass filter, configured to generate a first control voltage based on the first sensing voltage and a constant internal bias voltage, and generate a second control voltage based on the second sensing voltage and the constant internal bias voltage, wherein the first control voltage is generated by dividing the constant internal bias voltage by the first duty period, and the second control voltage is generated by dividing the constant internal bias voltage by the second duty period;
• and
• a compensator, electrically connected to the voltage divider, and configured to generate a ramp voltage signal based on the first control voltage and the second control voltage, wherein an average amplitude of the ramp voltage signal is a first constant value, and a maximum amplitude of the ramp voltage signal is a second constant value;
• wherein the equivalent series resistance compensation circuit outputs the ramp voltage signal, the constant internal bias voltage and the first sensing voltage;
• a comparator, electrically connected to the equivalent series resistance compensation circuit, and configured to generate a comparison result via comparing the constant internal bias voltage and the ramp voltage signal and comparing a comparison reference voltage with a feedback voltage;
• a turn-on time signal generator, electrically connected to the comparator and the equivalent series resistance compensation circuit, wherein the turn-on time signal generator generates a turn-on time signal based on the comparison result and the first sensing voltage;
• and
• a driving circuit, electrically connected to the turn-on time signal generator, configured to generate the first clock signal, the second clock signal and a driving signal;
• and
• a voltage converter, electrically connected to the driving circuit of the constant-frequency turn-on circuit, wherein the voltage converter is turned on or off to determine whether a voltage conversion is performed based on the driving signal.