BUCK converter circuit

A converter and circuit technology, applied in the field of buck converter circuits, can solve the problems affecting the stability of the power supply system, and achieve the effects of sufficient phase margin and gain margin, low and high frequency gain, and high voltage regulation accuracy.

Active Publication Date: 2014-05-28
SHENZHEN HUNTKEY ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the transmission characteristics of the LC filter connected in series at the output end will be inserted into the feedback loop of the power system, thus affecting the stability of the power system

Method used

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Embodiment Construction

[0019] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] combined reference figure 1 and figure 2 , figure 1 It is a schematic structural diagram of a preferred embodiment of the BUCK converter circuit of the present invention, figure 2 It is a circuit diagram of a preferred embodiment of the BUCK converter circuit of the present invention. The BUCK converter circuit provided in this embodiment includes:

[0021] DC power supply 10, used to provide power supply voltage;

[0022] BUCK circuit 20, used to reduce the voltage of DC power supply 10;

[0023] The LC filter 30 is used to filter the voltage stepped down by the BUCK circuit 20 and output it to the load R;

[0024] The feedback sampling compensation circuit 40 is used for sampling and feedback compensation to the output voltage of the BUCK circuit 20 and the output voltage of the LC filter 30;

[0025...

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PUM

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Abstract

The invention discloses a BUCK converter circuit. The BUCK converter circuit comprises a direct-current power supply used for providing a power supply voltage, a BUCK circuit used for reducing the voltage of the direct-current power supply, a LC filter used for filtering the voltage reduced by the BUCK circuit and outputting the filtered voltage to a load, a feedback sampling compensation circuit used for carrying out sampling and feedback compensation on an output voltage of the BUCK circuit and the output voltage of the LC filter, and a control circuit used for adjusting the output voltage of the BUCK circuit according to a sampling voltage of the feedback sampling compensation circuit. The stability and dynamic characteristic of the circuit are improved, and the output ripple and noise are reduced.

Description

technical field [0001] The invention relates to the technical field of electronic products, in particular to a BUCK converter circuit. Background technique [0002] In the fields of computer, communication, industrial control, instrumentation, medical equipment, etc., the application of switching power supply from high-voltage DC to low-voltage DC using BUCK converter circuit design has been very extensive. Especially in modern computer systems, multi-phase, multi-channel synchronous BUCK converter circuits are widely used. In the circuit design of multi-channel low-voltage and high-current synchronous BUCK converters, how to improve the dynamic load characteristics of the power supply while reducing the noise and ripple of the DC output is a difficult point in the design. In order to reduce noise and ripple, an LC filter is usually connected in series at the output end of a voltage-type or current-type buck converter circuit. Practice has proved that the transmission char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 段卫垠汪本强赵军
Owner SHENZHEN HUNTKEY ELECTRIC
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