Loop compensation circuit, switching power supply circuit and switching power supply charger

Abstract

The invention relates to the field of mobile phone chargers, and especially relates to a loop compensation circuit, a switching power supply circuit and a switching power supply charger. The loop compensation circuit comprises a main power circuit and a feedback control circuit with voltage outer loop feedback and current inner loop feedback, wherein the main power circuit performs voltage reduction and voltage ripple filtering on inputted direct current; and the feedback control circuit performs adjustment on output voltage of the main power circuit and then feeds back the regulated voltage to an input end of the main power circuit. The loop compensation circuit provided by the invention adopts the feedback control circuit with voltage outer loop feedback and the current inner loop feedback to perform feedback control on the output voltage, thereby improving the output stability, the transient response ability and the load linear regulation rate of the loop compensation circuit, and thus improving the charging efficiency of a switching power supply charger.

Description

technical field [0001] The invention relates to the field of mobile phone chargers, in particular to a loop compensation circuit, a switching power supply circuit and a switching power supply charger. Background technique [0002] The traditional RCC charger (self-excited flyback converter) has the advantages of simple control method and low price; self-excited oscillation does not require external clock control, and does not need to design auxiliary power; the disadvantage is: low efficiency and large noise , now chargers in the mobile phone field basically no longer use this technology. [0003] Under the condition of stable grid voltage, the existing mobile phone chargers have reasonable schemes for controlling the input voltage range, output voltage and output power. Using AC-DC conversion and feedback control, the output power has been greatly improved compared with the traditional RCC circuit. [0004] Under the condition of grid voltage fluctuation or load change, t...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a loop compensation circuit, a switching power supply circuit and a switching power supply charger, which are used to solve the problem of stable output and transient response of the converter system under the condition of grid voltage fluctuation or load change in the existing charging circuit. The ability and the linear regulation rate of the load have not been greatly improved to improve the output stability of the charging circuit, the ability of the transient response and the linear regulation rate of the load

Images