A power supply feedback apparatus

Abstract

The invention relates to a power supply feedback apparatus comprising a primary feedback module, an auxiliary feedback module and a feedback control module. The primary feedback module is used for sampling a voltage of a main output branch of the power supply and outputs a primary feedback voltage to the feedback control module. The auxiliary feedback module is used for reducing the primary feedback voltage when a voltage of an auxiliary output branch of the power supply decreases. The feedback control module is used for controlling the power supply to raise power output when the primary feedback voltage decreases so as to make the voltage of the auxiliary output branch back to normal. The circuit of the power supply feedback apparatus of the invention is simple. When circuit of the power supply feedback apparatus of the invention is implemented, a voltage dropping problem is easily solved, and power density and costs are also taken into consideration.

Description

technical field

[0001] The invention relates to the field of switching power supplies, more specifically, to a power supply feedback device. Background technique

[0002] Power supply is a very basic and very important part of electronic circuits. A common power supply has one main output branch, multiple auxiliary output branches and one main output branch feedback circuit. Therefore, there is only a feedback link in the main output branch, so it has a good load response speed, but because there is no feedback link in the auxiliary output branch, the load response speed is very poor, and undervoltage will occur, which will affect the normal operation of the circuit. Work.

[0003] Aiming at this technical problem, the existing solution is to increase the number and capacity of capacitors in the auxiliary output branch. Relying on the capacity of a large enough capacitor, the auxiliary output branch has a long enough holding time, thereby reducing the probability of under...

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