A kind of DC step-down regulation circuit structure

Abstract

The invention relates to a structure of a DC step-down regulation circuit, which is characterized in that it comprises a switch circuit and a feedback regulation circuit; the switch circuit is connected to the feedback regulation circuit; the output end of the switch circuit is connected with an output capacitor; the input end of the switch circuit is used for connecting the input voltage ; The feedback regulation circuit includes a voltage divider power supply, a first operational amplifier and a second operational amplifier; the positive input of the first operational amplifier is connected to the first voltage divider circuit; the negative input of the first operational amplifier is connected to the output capacitor; The connection point between the positive input of the first operational amplifier and the first voltage divider is connected with a pull-down circuit; the output of the first operational amplifier is connected with a switch circuit; the positive input of the second operational amplifier is connected with a second voltage divider circuit; the inverting input end of the second operational amplifier is connected to the inverting input end of the first operational amplifier; the output end of the second operational amplifier is connected to the switch circuit; the output end of the second operational amplifier is also connected to the pull-down circuit.

Description

technical field [0001] The invention belongs to the technical field of power supply step-down regulation, and in particular relates to a DC step-down regulation circuit structure. Background technique [0002] In the existing electronic equipment, it is necessary to convert the DC power provided by the power supply into the voltage required by various chips. The existing DC step-down regulator circuit is a switching power supply that utilizes the characteristics of the choke current change of the output inductor. By changing the input power For the on and off states of the output inductor, the step-down regulation of the output voltage is realized; the step-down regulation is realized by completely relying on the characteristics of the output inductor to maintain the current constant. The speed is slow, the inductance conduction loss cannot be avoided, and the conversion efficiency is limited. [0003] At the same time, the switching circuit keeps the output inductor in the...

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Problems solved by technology

[0002] In the existing electronic equipment, it is necessary to convert the DC power provided by the power supply into the voltage required by various chips. The existing DC step-down regulator circuit is a switching power supply that utilizes the characteristics of the choke current change of the output inductor. By changing the input power For the on and off states of the output inductor, the step-down regulation of the output voltage is realized; the step-down regulation is realized by completely relying on the characteristics of the output inductor to maintain the current constant. The disadvantages of slow speed, inductive conduction loss and limited conversion efficiency

[0003] At the same time, the switching circuit keeps the output inductor in the two stages of charging and releasing energy respectively. Using the characteristics of the inductor to maintain the current direction and hinder the change of the current, the step-down adjustment of the rear-end output voltage is realized by controlling the current, which has a slow adjustment speed. The inductance conduction loss cannot be avoided, the conversion efficiency is limited, the inductance models are numerous, and the circuit structure is complicated.

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