Compensation network, switching power supply circuit and circuit compensation method

Abstract

A compensation network, comprising a resistance-capacitance network, a unit gain amplifier network and an error amplifier network, wherein an output end of the resistance-capacitance network is cascaded to an input end of the unit gain amplifier network, and an output end of the unit gain amplifier network is cascaded to an input end of the error amplifier network; the resistance-capacitance network is configured to provide a voltage divider resistance and generate a zero point and a polar point which offset one another; the unit gain amplifier network is configured to generate a zero point for offsetting one polar point in a low-pass filter network and a polar point for suppressing high-frequency noise so as to increase the phase margin of a switch power supply circuit; and the error amplifier network is configured to generate a polar point for increasing one polar point of a low-frequency gain and a zero point for offsetting the other polar point in the low-pass filter network. In addition, the present invention also relates to a switch power supply circuit comprising the compensation network and a circuit compensation method.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a compensation network, a switching power supply circuit and a circuit compensation method. Background technique [0002] Power supply technology belongs to the category of power electronics technology. It is an edge-crossing technology integrating power conversion, modern electronics, automatic control and other disciplines. It has been widely used in industry, energy, transportation, information, aviation, national defense, education, culture, etc. field. The development of power supply technology actually revolves around the unremitting research on the trajectory of improving efficiency, improving performance, small and light weight, safety and reliability, eliminating power pollution, reducing electromagnetic interference and electrical noise. Switching power supply is a crucial part of the entire power supply technology , the compensation network of the pulse width...

AI Technical Summary

Problems solved by technology

However, when the operating frequency f of the switching power supply required by the switching power supply circuit is very high, due to the influence of the pole of the error amplifier itself, the stability of the switching power supply circuit cannot be guaranteed.

In addition, when a voltage dividing resistor needs to be connected at the input of the error amplifier, a pole will also be introduced, which has a great influence on the compensation

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